UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - 9 months ended Sep. 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)		324
Exercise of stock options (in shares)		15
Repurchases of common stock (in shares)						1,682
Employee stock purchase plan (in shares)						(27)
Shares at end of period (in shares) at Sep. 30, 2016		70,897				43,785
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		4	321
Exercise of stock options		0	172
Income tax benefit from stock-based compensation			265
Stock-based compensation expense			5,042
Repurchases of common stock						(30,775)
Employee stock purchase plan	528		241			287
Defined benefit pension plans, net of tax	(7)			(7)
Net income	23,534				23,534
Dividends, net of forfeitures ($0.36 per share)					(9,721)
Balance at end of period at Sep. 30, 2016	$ 128,990	$ 709	$ 426,317	$ 311	$ 168,909	$ (467,256)