Condensed Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, 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
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		69
Repurchases of common stock (in shares)		(5,525)
Net income	25,433			25,433
Other comprehensive loss	(8,539)				(8,539)
Dividends declared on common stock	(9,080)			(9,080)
Stock compensation expense	2,057		2,057
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(1,629)		(263)			(1,366)
Repurchases of common stock	(250,991)					(250,991)
Ending Balance at Mar. 31, 2013	510,894	876	206,243	1,036,896	(118,452)	(614,669)
Ending Balance (in shares) at Mar. 31, 2013		63,748
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
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		141
Repurchases of common stock (in shares)		(2)
Net income	31,476			31,476
Other comprehensive loss	(9,844)				(9,844)
Dividends declared on common stock	(9,689)			(9,689)
Stock compensation expense	3,742		3,742
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(4,320)		(644)			(3,676)
Repurchases of common stock	(113)					(113)
Ending Balance at Mar. 31, 2014	$ 725,095	$ 876	$ 215,920	$ 1,191,541	$ (47,963)	$ (635,279)
Ending Balance (in shares) at Mar. 31, 2014		63,554