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, 2014					$ (23,479)
Increase (Decrease) in Stockholders' Equity
Net income						$ 20,712
Other comprehensive loss, net of tax					2,529	2,529
Balances at Jun. 30, 2015					(20,950)
Balances at Dec. 31, 2015	$ 279	$ 309,653	$ 376,827	$ (70,535)	(27,496)	588,728
Balances (in shares) at Dec. 31, 2015	27,938			2,080
Increase (Decrease) in Stockholders' Equity
Net income			4,128			4,128
Other comprehensive loss, net of tax					(3,347)	(3,347)
Issuance of common stock under share-based compensation plans	$ 2	(2)
Issuance of common stock under share-based compensation plans (in shares)	175
Tax effect of share-based compensation plans		(1,927)				(1,927)
Share-based compensation expense		4,200				4,200
Purchase of treasury stock				$ (5,116)		(5,116)
Purchase of treasury stock (in shares)				283
Dividends declared on common stock			(4,175)			(4,175)
Balances at Jun. 30, 2016	$ 281	$ 311,924	$ 376,780	$ (75,651)	$ (30,843)	$ 582,491
Balances (in shares) at Jun. 30, 2016	28,113			2,363