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, 2013		63,415
Increase (Decrease) in Stockholders' Equity
Net issuance of treasury stock for vested restricted stock units, including tax benefit (in shares)		297
Repurchases of common stock (in shares)		(509)
Ending Balance (in shares) at Sep. 30, 2014		63,203
Beginning Balance at Dec. 31, 2013	$ 713,843	$ 876	$ 212,822	$ 1,169,754	$ (38,119)	$ (631,490)
Increase (Decrease) in Stockholders' Equity
Net income	158,755			158,755
Other comprehensive loss	(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)
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)		96
Repurchases of common stock (in shares)		(2,906)
Ending Balance (in shares) at Sep. 30, 2015		60,393
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	145,866			145,866
Other comprehensive loss	(31,254)				(31,254)
Dividends declared on common stock	(29,919)			(29,919)
Stock compensation expense	9,580		9,580
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(2,212)		(240)			(1,972)
Repurchases of common stock	(170,132)					(170,132)
Ending Balance at Sep. 30, 2015	$ 631,885	$ 876	$ 234,789	$ 1,429,468	$ (196,878)	$ (836,370)