Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2012	$ 692,406	$ 797	$ 224,517	$ 861,465	$ (405,641)	$ 11,268
Beginning Balance, Shares at Dec. 31, 2012		79,652
Net Income	45,794			45,794
Other comprehensive loss, net of tax	(515)					(515)
Dividend payments	(21,412)			(21,412)
Dividends accrued for unvested restricted stock units	(23)			(23)
Stock options exercised	3,629			(762)	4,391
RSUs and restricted stock vested	(248)		(248)	(611)	611
Purchase of treasury stock	(124,267)				(124,267)
Income tax effect of stock compensation arrangements	169		169
Stock-based compensation expense	9,073		9,073
Ending Balance at Dec. 31, 2013	604,606	$ 797	233,511	884,451	(524,906)	10,753
Ending Balance, Shares at Dec. 31, 2013		79,652
Net Income	44,620			44,620
Other comprehensive loss, net of tax	(10,828)					(10,828)
Dividend payments	(19,947)			(19,947)
Dividends accrued for unvested restricted stock units	(19)			(19)
Stock options exercised	2,839			(558)	3,397
RSUs and restricted stock vested	(326)		(326)	(796)	796
Purchase of treasury stock	(80,576)				(80,576)
Income tax effect of stock compensation arrangements	81		81
Stock-based compensation expense	8,563		8,563
Ending Balance at Dec. 31, 2014	549,013	$ 797	241,829	907,751	(601,289)	(75)
Ending Balance, Shares at Dec. 31, 2014		79,652
Net Income	18,646			18,646
Other comprehensive loss, net of tax	(8,894)					(8,894)
Dividend payments	(18,449)			(18,449)
Dividends accrued for unvested restricted stock units	(7)			(7)
Stock options exercised	961			(402)	1,363
RSUs and restricted stock vested	(69)		(69)	(767)	767
Purchase of treasury stock	(66,160)				(66,160)
Income tax effect of stock compensation arrangements	(1,593)		(1,593)
Stock-based compensation expense	6,712		6,712
Ending Balance at Dec. 31, 2015	$ 480,160	$ 797	$ 246,879	$ 906,772	$ (665,319)	$ (8,969)
Ending Balance, Shares at Dec. 31, 2015		79,652