Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance (in shares) at Dec. 31, 2013		63,415,000
Beginning Balance at Dec. 31, 2013	$ 713,843	$ 876	$ 212,822	$ 1,169,754	$ (38,119)	$ (631,490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	182,391			182,391
Other comprehensive loss	(127,505)				(127,505)
Dividends declared on common stock	(38,624)			(38,624)
Stock compensation expense	12,718		12,718
Net issuance of treasury stock for vested restricted stock units (in shares)		297,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(8,201)		(91)			(8,110)
Repurchases of common stock (in shares)		(509,000)
Repurchases of common stock	(24,666)					(24,666)
Ending Balance at Dec. 31, 2014	709,956	$ 876	225,449	1,313,521	(165,624)	(664,266)
Ending Balance (in shares) at Dec. 31, 2014		63,203,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	172,413			172,413
Other comprehensive loss	(43,182)				(43,182)
Dividends declared on common stock	(39,741)			(39,741)
Stock compensation expense	12,403		12,403
Net issuance of treasury stock for vested restricted stock units (in shares)		96,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(2,533)		(561)			(1,972)
Repurchases of common stock (in shares)		(2,906,000)
Repurchases of common stock	(170,132)					(170,132)
Ending Balance at Dec. 31, 2015	$ 639,184	$ 876	237,291	1,446,193	(208,806)	(836,370)
Ending Balance (in shares) at Dec. 31, 2015	60,392,905	60,393,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 153,351			153,351
Other comprehensive loss	(15,050)				(15,050)
Dividends declared on common stock	(40,877)			(40,877)
Stock compensation expense	13,018		13,018
Adoption of accounting standard update related to stock compensation accounting	525		598	(73)
Net issuance of treasury stock for vested restricted stock units (in shares)		114,000
Net issuance of treasury stock for vested restricted stock units, including tax benefit	(3,430)		(1,144)			(2,286)
Repurchases of common stock (in shares)		(5,456,000)
Repurchases of common stock	(277,306)					(277,306)
Ending Balance at Dec. 31, 2016	$ 469,415	$ 876	$ 249,763	$ 1,558,594	$ (223,856)	$ (1,115,962)
Ending Balance (in shares) at Dec. 31, 2016	55,051,158	55,051,000