Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income, net [Member]	Total
Balance in the beginning at Dec. 31, 2012	$ 523	$ 1,006,194	$ 43,273	$ (4)	$ 40,573	$ 1,090,559
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			6,927			6,927
Stock-based compensation		4,861				4,861
Issuance of stock under equity compensation plan, including tax benefit of $7 and $24 for the years ended 2014 and 2013, respectively		(256)				(256)
Repurchase of 0,000,000, 6,076,558, and 7,421,179 shares for the years ended 2015, 2014, and 2013, respectively, retirement of 7,421,419 treasury shares for the year ended 2013	(11)	(20,583)		(126,142)		(146,736)
Dividends paid ($0.00, $.20, and $0.20 per share for the years ended 2015, 2014, and 2014, respectively)			(10,234)			(10,234)
Other comprehensive income (loss)					(47,329)	(47,329)
Balance in the ending at Dec. 31, 2013	512	990,216	39,966	(126,146)	(6,756)	897,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			9,176			9,176
Stock-based compensation		3,572				3,572
Issuance of stock under equity compensation plan, including tax benefit of $7 and $24 for the years ended 2014 and 2013, respectively		(576)				(576)
Repurchase of 0,000,000, 6,076,558, and 7,421,179 shares for the years ended 2015, 2014, and 2013, respectively, retirement of 7,421,419 treasury shares for the year ended 2013				(119,370)		(119,370)
Dividends paid ($0.00, $.20, and $0.20 per share for the years ended 2015, 2014, and 2014, respectively)			(8,614)			(8,614)
Other comprehensive income (loss)					12,595	12,595
Balance in the ending at Dec. 31, 2014	512	993,212	40,528	(245,516)	5,839	794,575
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			4,881			4,881
Stock-based compensation		3,349				3,349
Issuance of stock under purchase and equity compensation plans, including tax benefit of $24, gains on reissuance of treasury stock of $96 for the year ended 2015	1	(1,701)		904		(796)
Repurchase of 0,000,000, 6,076,558, and 7,421,179 shares for the years ended 2015, 2014, and 2013, respectively, retirement of 7,421,419 treasury shares for the year ended 2013				(175,048)		(175,048)
Dividends paid ($0.00, $.20, and $0.20 per share for the years ended 2015, 2014, and 2014, respectively)			(6,739)			(6,739)
Warrant Reclassification		3,066				3,066
Other comprehensive income (loss)					(5,744)	(5,744)
Balance in the ending at Dec. 31, 2015	$ 513	$ 997,926	$ 38,670	$ (419,660)	$ 95	$ 617,544