UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect upon adoption of new accounting standard (Note A)			$ 769		$ (469)
Shares at beginning of period (in shares) at Dec. 31, 2016		71,268				44,469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		8
Exercise of stock options (in shares)		5
Repurchases of common stock (in shares)						83
Employee stock purchase plan (in shares)						(6)
Shares at end of period (in shares) at Mar. 31, 2017		71,281				44,546
Balance at beginning of period at Dec. 31, 2016	$ 121,736	$ 713	428,212	$ 184	174,967	$ (482,340)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance for stock-based compensation and dividends, net of forfeitures		0	164
Exercise of stock options		0	72
Stock-based compensation expense			2,064
Repurchases of common stock						(1,952)
Employee stock purchase plan	127		64			63
Defined benefit pension plans, net of tax of $2	(5)			5
Net income	5,902				5,902
Dividends, net of forfeitures ($0.12 per share)					(3,201)
Balance at end of period at Mar. 31, 2017	$ 125,207	$ 713	$ 431,345	$ 179	$ 177,199	$ (484,229)