Consolidated Statements of Shareholders' Deficit and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Comprehensive Income [Member]	Retained Earnings [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2008	$ (137,670)	$ 607	$ 90,141	$ (3,472)	$ (835,186)		$ 610,240
Common Stock, Shares, Outstanding at Dec. 31, 2008		60,704,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,250					98,250	98,250
Other Comprehensive Income, Net of Tax
Prior Service Costs	144					144
Net pension curtailment and remeasurement, net of tax	1,283					1,283
Actuarial pension gain/(loss), net of tax	165					165
Foreign currency translation adjustments	2,213					2,213
Other Comprehensive Income (loss)				3,805		3,805
Comprehensive Income						102,055
Exercise of stock options (shares)		764,612
Exercise of stock options	14,992	8	(2,106)		17,090
Issuance of restricted stock and PVRSU (shares)		281,889
Issuance of restricted stock and PVRSU	0	3	(7,612)		7,609
Cancellation of restricted stock (shares)		(43,408)
Cancellation of restricted stock	0	(1)	1,336		(1,335)
Stock compensation related to stock options	2,817		2,817
Amortization of deferred compensation related to restricted stock grants and PVRSU	6,155		6,155
Dividends declared	(44,059)						(44,059)
Treasury purchases (shares)		(2,188,888)
Treasury purchases	(59,124)	(22)			(59,102)
Issuance of treasury shares (shares)		22,049
Issuance of treasury shares	622				622
Stockholders' Equity Attributable to Parent at Dec. 31, 2009	(114,212)	595	90,731	333	(870,302)		664,431
Common Stock, Shares, Outstanding at Dec. 31, 2009		59,541,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,441					107,441	107,441
Other Comprehensive Income, Net of Tax
Settlement of forward starting interest rate swap agreement	(8,663)					(8,663)
Amortization of loss on cash flow hedge	332					332
Actuarial pension gain/(loss), net of tax	(459)					(459)
Foreign currency translation adjustments	1,265					1,265
Other Comprehensive Income (loss)				(7,525)		(7,525)
Comprehensive Income						99,916
Exercise of stock options (shares)		123,109
Exercise of stock options	1,723	1	1,408		314
Issuance of restricted stock and PVRSU (shares)		290,037
Issuance of restricted stock and PVRSU	0	3	(9,489)		9,486
Cancellation of restricted stock (shares)		(41,796)
Cancellation of restricted stock	0	(1)	1,267		(1,266)
Stock compensation related to stock options	2,398		2,398
Amortization of deferred compensation related to restricted stock grants and PVRSU	6,459		6,459
Dividends declared	(43,815)						(43,815)
Treasury purchases (shares)		(346,659)
Treasury purchases	(11,165)	(2)			(11,163)
Issuance of treasury shares (shares)		17,973
Issuance of treasury shares	625				625
Stockholders' Equity Attributable to Parent at Dec. 31, 2010	(58,071)	596	92,774	(7,192)	(872,306)		728,057
Common Stock, Shares, Outstanding at Dec. 31, 2010	59,583,770	59,583,770
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	110,396					110,396	110,396
Other Comprehensive Income, Net of Tax
Amortization of loss on cash flow hedge	862					862
Actuarial pension gain/(loss), net of tax	(1,086)					(1,086)
Foreign currency translation adjustments	615					615
Other Comprehensive Income (loss)				391		391
Comprehensive Income						110,787
Exercise of stock options (shares)		175,386
Exercise of stock options	6,580	2	5,871		707
Issuance of restricted stock and PVRSU (shares)		247,298
Issuance of restricted stock and PVRSU	0	2	(9,604)		9,602
Cancellation of restricted stock (shares)		(68,580)
Cancellation of restricted stock	0	0	2,300		(2,300)
Stock compensation related to stock options	2,842		2,842
Amortization of deferred compensation related to restricted stock grants and PVRSU	8,482		8,482
Dividends declared	(43,506)						(43,506)
Treasury purchases (shares)		(1,681,324)
Treasury purchases	(53,414)	(17)			(53,397)
Issuance of treasury shares (shares)		21,096
Issuance of treasury shares	739				739
Stockholders' Equity Attributable to Parent at Dec. 31, 2011	$ (25,561)	$ 583	$ 102,665	$ (6,801)	$ (916,955)		$ 794,947
Common Stock, Shares, Outstanding at Dec. 31, 2011	58,277,646	58,277,646