Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock Common Class A	Common Stock Common Class B	Additional Paid In Capital	Treasury Stock Common Class A	Retained Earnings	Accumulated Comprehensive Income(Loss)	Non-controlling Interest	Total
Balance at the beginning of the period at Dec. 31, 2019	$ 3	$ 2	$ 274,518	$ (60,521)	$ 16,075	$ (792)	$ 1,384	$ 230,669
Balance at the beginning of the period (in shares) at Dec. 31, 2019	25,202	19,720
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net income					(9,428)		(115)	(9,543)
Stock-based compensation			1,280					1,280
Other comprehensive loss, net of tax						(1,887)		(1,887)
Balance at the end of the period at Mar. 31, 2020	$ 3	$ 2	275,798	(60,521)	6,647	(2,679)	1,269	220,519
Balance at the end of the period (in shares) at Mar. 31, 2020	25,202	19,720
Balance at the beginning of the period at Dec. 31, 2020	$ 3	$ 2	279,800	(61,453)	14,840	(2,187)	481	231,486
Balance at the beginning of the period (in shares) at Dec. 31, 2020	25,458	19,720
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net income					33,358		23	33,381
Issuance of Class A Common Stock			2,778	(1,077)				1,701
Issuance of Class A Common Stock (in shares)	238
Stock-based compensation			1,305					1,305
Vesting of restricted stock				(10)				(10)
Vesting of restricted stock (in shares)	3
Repurchases of Class A common stock				(1,321)				(1,321)
Exercise of stock options			0	(43)				(43)
Exercise of stock options (in shares)	13
Other comprehensive loss, net of tax						344		344
Balance at the end of the period at Mar. 31, 2021	$ 3	$ 2	$ 283,883	$ (63,904)	$ 48,198	$ (1,843)	$ 504	$ 266,843
Balance at the end of the period (in shares) at Mar. 31, 2021	25,712	19,720