CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Jan. 30, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	$ 4,116			$ 4,116
Income tax shortfall from stock option plan	(596)			(596)
Surrender of stock to satisfy minimum tax withholding	(128)		(129)	1
Compensation under employee stock compensation plans	3,374			3,374
Stock Issued During Period, Value, Acquisitions	106,684	2		106,682
Net income	(69,142)				(69,142)
Balance at Dec. 31, 2010	200,101	6	(10,496)	368,254	(157,663)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	3,198			3,198
Surrender of stock to satisfy minimum tax withholding	(189)		(189)
Stock Issued During Period, Value, Treasury Stock Reissued, Compensation	0		224	(224)
Compensation under employee stock compensation plans	4,297			4,297
Net income	7,872				7,872
Balance at Dec. 31, 2011	215,279	6	(10,461)	375,525	(149,791)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee stock compensation plans	8,611			8,611
Surrender of stock to satisfy minimum tax withholding	(174)		(174)
Stock Issued During Period, Value, Treasury Stock Reissued, Compensation	0		324	(324)
Compensation under employee stock compensation plans	4,986			4,986
Net income	64,707				64,707
Balance at Dec. 31, 2012	$ 293,409	$ 6	$ (10,311)	$ 388,798	$ (85,084)

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Net Income

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Reference 11: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Research Bulletin (ARB)

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-Paragraph A7

-Appendix A

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-Name Accounting Research Bulletin (ARB)

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-Subparagraph d

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-Publisher FASB

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Reference 15: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 16: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References+ Details

- Definition

Value of stock issued pursuant to acquisitions during the period.

+ References+ Details

- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References+ Details