UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - 9 months ended Sep. 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)		474
Exercise of stock options (in shares)	32	32
Repurchases of common stock (in shares)						1,024
Employee stock purchase plan (in shares)						(20)
Shares at end of period (in shares) at Sep. 30, 2015		70,535				41,620
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	401
Exercise of stock options		0	381
Income tax benefit from stock-based compensation			408
Stock-based compensation expense			4,261
Employee stock purchase plan	435		242			193
Pension plans, net of tax	3			3
Net income	30,923				30,923
Dividends, net of forfeitures ($0.33 per share)					(9,668)
Repurchases of common stock						(24,468)
Balance at end of period at Sep. 30, 2015	$ 142,069	$ 705	$ 418,335	$ (368)	$ 146,633	$ (423,236)