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	Non-controlling Interest	Total
Balance at the beginning of the period at Dec. 31, 2017	$ 3	$ 2	$ 265,329	$ (57,303)	$ 30,401	$ 472		$ 238,904
Balance at the beginning of the period (in shares) at Dec. 31, 2017	25,171	20,801
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net (loss) income					(12,665)			(12,665)
Stock-based compensation			1,998					1,998
Vesting of restricted stock	$ 0		0	(326)				(326)
Vesting of restricted stock (in shares)	199
Repurchases of Class A common stock				(1,555)				(1,555)
Forfeiture of common stock earnouts	$ 0	$ 0	0
Forfeiture of common stock earnouts (in shares)	(544)	(1,081)
Exercise of warrants	$ 0		20					20
Exercise of warrants (in shares)	2
Other comprehensive income (loss), net of tax						1,637		1,637
Balance at the end of the period at Jun. 30, 2018	$ 3	$ 2	267,347	(59,184)	17,736	2,109		228,013
Balance at the end of the period (in shares) at Jun. 30, 2018	24,828	19,720
Balance at the beginning of the period at Mar. 31, 2018	$ 3	$ 2	266,345	(57,337)	22,842	1,622		233,477
Balance at the beginning of the period (in shares) at Mar. 31, 2018	25,173	20,801
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net (loss) income					(5,106)			(5,106)
Stock-based compensation			1,002					1,002
Vesting of restricted stock	$ 0		0	(326)				(326)
Vesting of restricted stock (in shares)	199
Repurchases of Class A common stock				(1,521)				(1,521)
Forfeiture of common stock earnouts	$ 0	$ 0	0
Forfeiture of common stock earnouts (in shares)	(544)	(1,081)
Other comprehensive income (loss), net of tax						487		487
Balance at the end of the period at Jun. 30, 2018	$ 3	$ 2	267,347	(59,184)	17,736	2,109		228,013
Balance at the end of the period (in shares) at Jun. 30, 2018	24,828	19,720
Balance at the beginning of the period at Dec. 31, 2018	$ 2	$ 2	270,345	(59,088)	19,495	1,155	$ 1,488	233,399
Balance at the beginning of the period (in shares) at Dec. 31, 2018	24,850	19,720
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net (loss) income					(4,044)		(37)	(4,081)
Issuance of treasury shares for acquisition of Snap Media			(588)	588
Stock-based compensation			1,360					1,360
Vesting of restricted stock	$ 1			(532)				(531)
Vesting of restricted stock (in shares)	184
Repurchases of Class A common stock				(648)				(648)
Issuance of treasury shares for option exercise				107				107
Adoption of accounting standards | ASU 2018-02					(53)	53
Other comprehensive income (loss), net of tax						(1,855)		(1,855)
Balance at the end of the period at Jun. 30, 2019	$ 3	$ 2	271,117	(59,573)	15,398	(647)	1,451	227,751
Balance at the end of the period (in shares) at Jun. 30, 2019	25,034	19,720
Balance at the beginning of the period at Mar. 31, 2019	$ 2	$ 2	270,674	(59,013)	17,756	530	1,441	231,392
Balance at the beginning of the period (in shares) at Mar. 31, 2019	24,850	19,720
Condensed Consolidated Statements of Changes in Stockholders' Equity
Net (loss) income					(2,358)		10	(2,348)
Stock-based compensation			443					443
Vesting of restricted stock	$ 1			(532)				(531)
Vesting of restricted stock (in shares)	184
Repurchases of Class A common stock				(135)				(135)
Issuance of treasury shares for option exercise				107				107
Other comprehensive income (loss), net of tax						(1,177)		(1,177)
Balance at the end of the period at Jun. 30, 2019	$ 3	$ 2	$ 271,117	$ (59,573)	$ 15,398	$ (647)	$ 1,451	$ 227,751
Balance at the end of the period (in shares) at Jun. 30, 2019	25,034	19,720