UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )
Willbros Group, Inc.
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(Name of Issuer)
COMMON STOCK
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(Title of Class of Securities)
969199108
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(CUSIP Number)
SEC 1745 (3-98) Page 1 of 8 Pages
December 31, 2006 13G Page 2 of 8 Pages
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
/_X__/ Rule 13d-1(b)
/____/ Rule 13d-1(c)
/____/ Rule 13d-1(d)
* The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.
The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
that section of the Act but shall be subject to all other provisions of the
Act (however, see the Notes).
Potential persons who are to respond to the collection of information
contained in this form are not required to respond unless the form displays
a currently valid OMB control number.
CUSIP No. 969199108 13G Page 3 of 8 Pages
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1 NAME OF REPORTING PERSONS
IRS IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
ICM Asset Management, Inc. 91-1150802
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a)/ X /
(b)/ /
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Washington
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NUMBER OF 5 SOLE VOTING POWER
SHARES 0
BENEFICIALLY ---------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 717,381
REPORTING ---------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH 0
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8 SHARED DISPOSITIVE POWER
1,408,206
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
PERSON
1,408,206
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10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.5%
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12 TYPE OF REPORTING PERSON (See Instructions)
IA, CO
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CUSIP No. 969199108 13G Page 4 of 8 Pages
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1 NAME OF REPORTING PERSONS
IRS IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
James M. Simmons
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(See Instructions)
(a)/ X /
(b)/ /
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
U.S.
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NUMBER OF 5 SOLE VOTING POWER
SHARES 0
BENEFICIALLY ---------------------------------------
OWNED BY 6 SHARED VOTING POWER
EACH 717,381
REPORTING ---------------------------------------
PERSON 7 SOLE DISPOSITIVE POWER
WITH 0
---------------------------------------
8 SHARED DISPOSITIVE POWER
1,408,206
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,408,206
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10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(See Instructions)
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.5%
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12 TYPE OF REPORTING PERSON (See Instructions)
IN, HC
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CUSIP No. 969199108 13G Page 5 of 8 Pages
ITEM 1.
(a) The name of the issuer is Willbros Group, Inc.
(the "Issuer").
(b) The principal executive office of the Issuer is located at:
Plaza 2000 Building
50th Street, 8th Floor
P. O. Box 0816-01098
Panama, Republic of Panama
ITEM 2.
(a) The names of the persons filing this statement are:
ICM Asset Management, Inc., and
James M. Simmons
(collectively, the "Filers").
(b) The principal business office of the Filers is located at:
601 W. Main Avenue, Suite 600
Spokane, WA 99201.
(c) See Item 4 of the cover sheet for each Filer.
(d) This statement relates to shares of common stock of the Issuer
(the "Stock").
(e) The CUSIP number of the Stock is 969199108.
CUSIP No. 969199108 13G Page 6 of 8 Pages
ITEM 3. If this statement is filed pursuant to rule 240.13d-1(b)
or 240.13d-2(b) or (c), check whether the person filing is a:
(a) ___ Broker or dealer registered under section 15 of the Act
(15 U.S.C. 78o).
(b) ___ Bank as defined in section 3(a)(6) of the Act (15 U.S.C.
78c).
(c) ___ Insurance company as defined in section 3(a)(19) of the
Act (15 U.S.C. 78c).
(d) ___ Investment company registered under section 8 of the
Investment Company Act of 1940 (15 U.S.C. 80a-8).
(e) _X__ An investment adviser in accordance with 240.13d-
1(b)(1)(ii)(E)(as to ICM Asset Management, Inc.).
(f) ___ An employee benefit plan or endowment fund in accordance
with 240.13d-1(b)(1)(ii)(F).
(g) _X__ A parent holding company or control person in accordance
with 240.13d-1(b)(1)(ii)(G)(as to James M. Simmons).
(h) ___ A savings association as defined in section 3(b) of the
Federal Deposit Insurance Act (12 U.S.C. 1813).
(i) ___ A church plan that is excluded from the definition of an
investment company under section 3(c)(14) of the
Investment Company Act of 1940 (15 U.S.C. 80a-3).
(j) _X__ Group, in accordance with section 240.13d-1(b)(1)(ii)(J)
(as to ICM Asset Management, Inc. and James M. Simmons).
CUSIP No. 969199108 13G Page 7 of 8 Pages
ITEM 4. OWNERSHIP
See Items 5-9 and 11 on the cover page for each Filer.
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following /___/.
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
ICM Asset Management, Inc. is a registered investment adviser whose
clients have the right to receive or the power to direct the receipt
of dividends from, or the proceeds from the sale of, the Stock.
James M. Simmons is the Chief Executive Officer and controlling shareholder
of ICM Asset Management, Inc. No individual client's holdings of the Stock
are more than five percent of the outstanding Stock.
CUSIP No. 969199108 13G Page 8 of 8 Pages
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
Not applicable.
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
ICM Asset Management, Inc. and James M. Simmons constitute a group
within the meaning of rule 13d-5(b)(1), but are not part of a group with
any other person.
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Not applicable.
ITEM 10. CERTIFICATION
By ICM Asset Management, Inc. and James M. Simmons:
By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above are held in the ordinary course of
business and were not acquired and are not held for the purpose of or
with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose
or effect.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete
and correct.
Dated: February 14, 2007
ICM Asset Management, Inc.
______________________________________
By: Robert J. Law, Sr. Vice President
______________________________________
James M. Simmons