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, 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
Beginning Balance at Dec. 31, 2014	709,956	876	225,449	1,313,521	(165,624)	(664,266)
Beginning Balance (in shares) at Dec. 31, 2014		63,203
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		78
Repurchases of common stock (in shares)		(2,766)
Net income	33,304			33,304
Other comprehensive loss	(29,677)				(29,677)
Dividends declared on common stock	(10,292)			(10,292)
Stock compensation expense	4,018		4,018
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(1,776)		(4)			(1,772)
Repurchases of common stock	(162,630)					(162,630)
Ending Balance at Mar. 31, 2015	$ 542,903	$ 876	$ 229,463	$ 1,336,533	$ (195,301)	$ (828,668)
Ending Balance (in shares) at Mar. 31, 2015		60,515