CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balances at Dec. 31, 2015					$ (27,496)
Increase (Decrease) in Stockholders' Equity
Net income						$ 4,128
Other comprehensive income, net of tax					(3,347)	(3,347)
Balances at Jun. 30, 2016					(30,843)
Balances at Dec. 31, 2016	$ 282	$ 315,318	$ 386,917	$ (80,045)	(23,417)	599,055
Balances (in shares) at Dec. 31, 2016	28,174			2,565
Increase (Decrease) in Stockholders' Equity
Net income			8,370			8,370
Other comprehensive income, net of tax					1,391	1,391
Issuance of common stock under share-based compensation plans	$ 3	(3)
Issuance of common stock under share-based compensation plans (in shares)	276
Tax effect of share-based compensation plans		(2,580)				(2,580)
Share-based compensation expense		3,599				3,599
Purchase of treasury stock				$ (3,611)		(3,611)
Purchase of treasury stock (in shares)				195
Dividends declared on common stock			(4,144)			(4,144)
Balances at Jun. 30, 2017	$ 285	$ 316,334	$ 391,143	$ (83,656)	$ (22,026)	$ 602,080
Balances (in shares) at Jun. 30, 2017	28,450			2,760