UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Shares at beginning of period (in shares) at Dec. 31, 2014		70,029				40,616
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		487
Exercise of stock options (in shares)	32	32
Repurchases of common stock (in shares)						714
Employee stock purchase plan (in shares)						(14)
Shares at end of period (in shares) at Jun. 30, 2015		70,548				41,316
Balance at beginning of period at Dec. 31, 2014	$ 139,388	$ 700	$ 412,642	$ (371)	$ 125,378	$ (398,961)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures		5	274
Exercise of stock options		0	381
Income tax benefit from stock-based compensation			311
Stock-based compensation expense			2,913
Employee stock purchase plan	316		178			138
Pension plans, net of tax	2			2
Net income	17,378				17,378
Dividends, net of forfeitures ($0.22 per share) (in dollars per share)					(6,481)
Repurchases of common stock						(16,253)
Balance at end of period at Jun. 30, 2015	$ 138,234	$ 705	$ 416,699	$ (369)	$ 136,275	$ (415,076)