Condensed Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance at Dec. 31, 2012	$ 753,643	$ 876	$ 204,449	$ 1,020,543	$ (109,913)	$ (362,312)
Beginning Balance (in shares) at Dec. 31, 2012		69,204,000
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		90,000
Repurchases of common stock (in shares)		(5,879,000)
Net income	162,137			162,137
Other comprehensive income	3,694				3,694
Dividends declared on common stock	(27,173)			(27,173)
Stock compensation expense	6,835		6,835
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(2,116)		(545)			(1,571)
Repurchases of common stock	(267,607)					(267,607)
Ending Balance at Sep. 30, 2013	629,413	876	210,739	1,155,507	(106,219)	(631,490)
Ending Balance (in shares) at Sep. 30, 2013		63,415,000
Beginning Balance at Dec. 31, 2013	713,843	876	212,822	1,169,754	(38,119)	(631,490)
Beginning Balance (in shares) at Dec. 31, 2013		63,415,000
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		297,000
Repurchases of common stock (in shares)	(508,667)	(509,000)
Net income	158,755			158,755
Other comprehensive income	(39,897)				(39,897)
Dividends declared on common stock	(29,007)			(29,007)
Stock compensation expense	10,324		10,324
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(8,053)		57			(8,110)
Repurchases of common stock	(24,666)					(24,666)
Ending Balance at Sep. 30, 2014	$ 781,299	$ 876	$ 223,203	$ 1,299,502	$ (78,016)	$ (664,266)
Ending Balance (in shares) at Sep. 30, 2014		63,203,000