Condensed Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
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)
Ending Balance (in shares) at Mar. 31, 2015		60,515
Beginning Balance at Dec. 31, 2014	$ 709,956	$ 876	$ 225,449	$ 1,313,521	$ (165,624)	$ (664,266)
Increase (Decrease) in Stockholders' Equity
Net income	33,304			33,304
Other comprehensive income (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)
Beginning Balance (in shares) at Dec. 31, 2015		60,393
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		75
Ending Balance (in shares) at Mar. 31, 2016		60,468
Beginning Balance at Dec. 31, 2015	639,184	$ 876	237,291	1,446,193	(208,806)	(836,370)
Increase (Decrease) in Stockholders' Equity
Net income	26,572			26,572
Other comprehensive income (loss)	11,350				11,350
Dividends declared on common stock	(10,456)			(10,456)
Stock compensation expense	3,059		3,059
Adoption of accounting standard update related to stock compensation accounting	525		598	(73)
Net issuance of treasury stock for vested restricted stock units including tax benefit	(2,204)		(744)			(1,460)
Ending Balance at Mar. 31, 2016	$ 668,030	$ 876	$ 240,204	$ 1,462,236	$ (197,456)	$ (837,830)