UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - 6 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Treasury Stock
Shares at beginning of period (in shares) at Dec. 31, 2015		70,558				42,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		490
Exercise of stock options (in shares)		15
Repurchases of common stock (in shares)						1,178
Employee stock purchase plan (in shares)						(18)
Shares at end of period (in shares) at Jun. 30, 2016		71,063				43,290
Balance at beginning of period at Dec. 31, 2015	$ 139,627	$ 705	$ 420,276	$ 318	$ 155,096	$ (436,768)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures		5	304
Exercise of stock options		0	172
Income tax benefit from stock-based compensation			238
Stock-based compensation expense			3,706
Repurchases of common stock						(21,173)
Employee stock purchase plan	384		192			192
Defined benefit pension plans, net of tax	(5)			(5)
Net income	14,514				14,514
Dividends, net of forfeitures ($0.24 per share)					(6,606)
Balance at end of period at Jun. 30, 2016	$ 131,166	$ 710	$ 424,888	$ 313	$ 163,004	$ (457,749)