Condensed Consolidated Statement of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Total stockholders' equity - Beginning Balance	$ 264,626	$ 6	$ (49,458)	$ 224,480	$ (20,799)	$ 110,397
Beginning Balance (in shares) at Dec. 31, 2016		63,391	9,303
Total stockholders' equity - Beginning Balance	292,269	$ 6	$ (54,938)	232,979	(12,772)	126,994
Net income	17,479					17,479
Total other comprehensive income, net of tax	8,027				8,027
Comprehensive income	25,506
Issuance of common stock upon exercise of stock awards (in shares)		537
Issuance of common stock upon exercise of stock awards	725			725
Issuance of treasury shares as consideration for acquisition (in shares)		(36)	(405)
Issuance of common stock and treasury shares as consideration for acquisition	4,678		$ 4,561	385		(269)
Acquisition of treasury shares (in shares)			1,029
Acquisition of treasury shares	(10,041)		$ (10,041)
Stock-based compensation expense	5,296			5,296
Cumulative effect of change related to adoption of ASU 2016-09	1,480			2,093		(613)
Ending Balance (in shares) at Sep. 30, 2017		63,964	9,927
Total stockholders' equity - Ending Balance at Sep. 30, 2017	292,269	$ 6	$ (54,938)	232,979	(12,772)	126,994
Total stockholders' equity - Beginning Balance	$ 292,269	$ 6	$ (54,938)	$ 232,979	$ (12,772)	$ 126,994