Condensed Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance at Dec. 31, 2011	$ 657,994	$ 875	$ 196,626	$ 902,987	$ (115,282)	$ (327,212)
Beginning Balance (in shares) at Dec. 31, 2011		69,884
Net income	32,750			32,750
Other comprehensive (loss) income	15,394				15,394
Dividends declared on common stock	(8,487)			(8,487)
Stock compensation expense	1,727		1,727
Stock option exercises, including tax benefit of $485 (in shares)		30
Stock option exercises, including tax benefit of $485	640	1	639
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $829 in 2012 and $531 in 2013 (in shares)		74
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $829 in 2012 and $531 in 2013	(863)		76			(939)
Repurchases of common stock (in shares)		(114)
Repurchases of common stock	(5,015)					(5,015)
Ending Balance at Mar. 31, 2012	694,140	876	199,068	927,250	(99,888)	(333,166)
Ending Balance (in shares) at Mar. 31, 2012		69,874
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
Net income	25,433			25,433
Other comprehensive (loss) income	(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 of $829 in 2012 and $531 in 2013 (in shares)		69
Net issuance of treasury stock for vested restricted stock units, including tax benefit of $829 in 2012 and $531 in 2013	(1,629)		(263)			(1,366)
Repurchases of common stock (in shares)		(5,525)
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