Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interest
Beginning Balance at Dec. 31, 2018	$ 387,352	$ 95	$ 247,790	$ 144,364	$ (5,640)	$ 743
Comprehensive income:
Net income	10,350			10,267		83
Other comprehensive income (loss)	5,619				5,619
Stock-based compensation expense	1,108		1,108
Exercise of stock options, net	698		698
Issuance of common stock	148		148
Purchase and retirement of common stock	(5,682)	(1)	(5,681)
Ending Balance at Mar. 31, 2019	399,593	94	244,063	154,631	(21)	826
Beginning Balance at Dec. 31, 2019	516,990	106	312,733	199,005	4,418	728
Comprehensive income:
Net income	10,673			10,555		118
Other comprehensive income (loss)	3,161				3,161
Stock-based compensation expense	1,299		1,299
Exercise of stock options, net	851		851
Issuance of common stock	215		215
Purchase and retirement of common stock	(15,197)	(2)	(15,195)
Distribution to noncontrolling interest	(77)					(77)
Ending Balance at Mar. 31, 2020	$ 511,740	$ 104	$ 299,903	$ 203,385	$ 7,579	$ 769