Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member] Common Class B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Common Class B [Member]	Total
Balances at Dec. 31, 2017	$ 4	$ 26	$ 51,025	$ 77,574	$ (1,635)	$ (36,953)		$ 90,041
Purchase of 156,797 shares of class A and 3,677 shares of class B treasury stock						(5,630)		(5,630)
Issuance of 344,958 class A common shares and 9,296 class B common shares for the exercise of stock options			4,919					4,919
Issuance of restricted common shares, net of forfeitures (3,496 class A shares)
Non-cash stock compensation expense			995					995
Settlement of restricted common shares and stock options in connection with Recapitalization for cash of $3,271 and 90,369 class A common shares			(2,548)			(723)		(3,271)
Settlement of class B common shares in connection with Recapitalization (3,527,246 class B common shares exchanged for $69,099 cash and 3,527,246 class A common shares)		4	118,335			(187,438)		(69,099)
Retirement of class B common shares in connection with Recapitalization (retirement of 4,328,552 class B common shares)	(4)		(17,112)	(186,944)		204,060
Dividends declared of $0.27 and $0.60 per A and B common share, respectively				(8,429)				(8,429)
Other comprehensive income, foreign currency translation adjustment					(698)			(698)
Net income				15,254			$ 4,624	15,254
Balances at Jun. 30, 2018		30	155,614	(99,810)	(2,333)	(26,684)		26,817
Cumulative effect adjustment for adoption of ASC 606 | Accounting Standards Update 2014-09 [Member]				$ 2,735				$ 2,735