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						$ 39,866
Other comprehensive loss, net of tax					(4,106)	(4,106)
Balances at Sep. 30, 2015					(27,585)
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			17,068			17,068
Other comprehensive loss, net of tax					(943)	(943)
Issuance of common stock under share-based compensation plans	$ 2	(2)
Issuance of common stock under share-based compensation plans (in shares)	184
Tax effect of share-based compensation plans		(2,008)				(2,008)
Share-based compensation expense		6,151				6,151
Purchase of treasury stock				$ (7,594)		(7,594)
Purchase of treasury stock (in shares)				420
Dividends declared on common stock			(6,249)			(6,249)
Balances at Sep. 30, 2016	$ 281	$ 313,794	$ 387,646	$ (78,129)	$ (28,439)	$ 595,153
Balances (in shares) at Sep. 30, 2016	28,122			2,500