Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Equity	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interest
Balance at Dec. 31, 2015	$ 109,687	$ 12,200	$ 42	$ 45,220	$ 51,059	$ 980	$ 186
Comprehensive income:
Net income	18,694				18,462		232
Other comprehensive loss	(3,707)					(3,707)
Stock-based compensation expense	1,608			1,608
Exercise of stock options, net, including income tax benefit	1,760			1,760
Issuance of common stock in acquisitions, net of capitalized issuance costs	165,035		44	164,991
Equity awards assumed in acquisition	1,182			1,182
Issuance of common stock	140		1	139
Purchase and retirement of common stock	(5,201)		(1)	(5,200)
Redemption of preferred stock	(12,200)	(12,200)
Preferred stock dividends	(633)				(633)
Balance at Dec. 31, 2016	276,365	$ 0	86	209,700	68,888	(2,727)	418
Comprehensive income:
Net income	33,433				33,150		283
Other comprehensive loss	934					934
Stock-based compensation expense	3,064			3,064
Exercise of stock options, net	3,801		2	3,799
Issuance of common stock in acquisitions, net of capitalized issuance costs	62,060		13	62,047
Issuance of common stock	229			229
Purchase and retirement of common stock	(15,007)		(3)	(15,004)
Reclassification of stranded tax effects in accumulated other comprehensive income					353	(353)
Balance at Dec. 31, 2017	364,879		98	263,835	102,391	(2,146)	701
Comprehensive income:
Net income	41,353				41,036		317
Other comprehensive loss	(2,557)					(2,557)
Stock-based compensation expense	4,901			4,901
Exercise of stock options, net	1,518		1	1,517
Issuance of common stock	282			282
Purchase and retirement of common stock	(22,749)		(4)	(22,745)
Reclassification of stranded tax effects in accumulated other comprehensive income					937
Distribution to noncontrolling interest	(275)						(275)
Balance at Dec. 31, 2018	$ 387,352		$ 95	$ 247,790	$ 144,364	(5,640)	$ 743
Comprehensive income:
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-01						$ (937)