Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Common Stock Held in Treasury	Accumulated Other Comprehensive Income/(Loss)
Balance at Dec. 31, 2009	$ 867,700	$ 517	$ 233,374	$ 809,153	$ (182,743)	$ 7,399
Increase (Decrease) in Stockholders' Equity
Net (loss) income	23,980			23,980
Other comprehensive (loss) income	3,094					3,094
Issuance of common stock for stock options (111,792 shares) and (125,268 shares), restricted share awards (670,933 shares), (787,399 shares) and (317,489 shares) and employee stock unit awards (71,580 shares), (288,917 shares) and (311,106 shares), including tax benefit shortfall and award cancellations of $4.1 million, $3.3 million and $2.2 million for the years 2012, 2011 and 2010, respectively	7,036		(9,925)		16,961
Issuance of common stock for the employee stock purchase plan (137,782 shares), (108,621 shares) and (108,454 shares) for the years 2012, 2011 and 2010, respectively	1,651	1	1,650
Majestic acquisition replacement awards	2,994		2,994
Purchase of common stock for treasury (2,470,000 shares), (2,974,200 shares) and (3,151,828 shares) for the years 2012, 2011 and 2010, respectively	(50,284)				(50,284)
Shares withheld for net settlements of share-based awards (270,467 shares), (369,099 shares) and (235,075 shares) for the years 2012, 2011 and 2010, respectively	(4,095)				(4,095)
Share-based compensation	17,992		17,992
Balance at Dec. 31, 2010	870,068	518	246,085	833,133	(220,161)	10,493
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(179,789)			(179,789)
Other comprehensive (loss) income	(2,152)					(2,152)
Issuance of common stock for stock options (111,792 shares) and (125,268 shares), restricted share awards (670,933 shares), (787,399 shares) and (317,489 shares) and employee stock unit awards (71,580 shares), (288,917 shares) and (311,106 shares), including tax benefit shortfall and award cancellations of $4.1 million, $3.3 million and $2.2 million for the years 2012, 2011 and 2010, respectively	5,229		(19,285)		24,514
Issuance of common stock for the employee stock purchase plan (137,782 shares), (108,621 shares) and (108,454 shares) for the years 2012, 2011 and 2010, respectively	1,254	1	1,253
Purchase of common stock for treasury (2,470,000 shares), (2,974,200 shares) and (3,151,828 shares) for the years 2012, 2011 and 2010, respectively	(38,928)				(38,928)
Shares withheld for net settlements of share-based awards (270,467 shares), (369,099 shares) and (235,075 shares) for the years 2012, 2011 and 2010, respectively	(5,984)				(5,984)
Share-based compensation	21,416		21,416
Balance at Dec. 31, 2011	671,114	519	249,469	653,344	(240,559)	8,341
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(247,859)			(247,859)
Other comprehensive (loss) income	3,533					3,533
Issuance of common stock for stock options (111,792 shares) and (125,268 shares), restricted share awards (670,933 shares), (787,399 shares) and (317,489 shares) and employee stock unit awards (71,580 shares), (288,917 shares) and (311,106 shares), including tax benefit shortfall and award cancellations of $4.1 million, $3.3 million and $2.2 million for the years 2012, 2011 and 2010, respectively	(2,584)		(16,306)		13,722
Awards reclassified to liability for cash settlement (259,840 shares)	(2,838)		(2,838)
Issuance of common stock for the employee stock purchase plan (137,782 shares), (108,621 shares) and (108,454 shares) for the years 2012, 2011 and 2010, respectively	1,131	1	1,130
Purchase of common stock for treasury (2,470,000 shares), (2,974,200 shares) and (3,151,828 shares) for the years 2012, 2011 and 2010, respectively	(23,457)				(23,457)
Shares withheld for net settlements of share-based awards (270,467 shares), (369,099 shares) and (235,075 shares) for the years 2012, 2011 and 2010, respectively	(2,817)				(2,817)
Share-based compensation	13,547		13,547
Balance at Dec. 31, 2012	$ 409,770	$ 520	$ 245,002	$ 405,485	$ (253,111)	$ 11,874