CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2014	$ 65	$ 13	$ 3,229	$ 45	$ (112,422)	$ 584	$ (108,486)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income				0	(15,940)	2,438	(13,502)
Foreign currency translation gain (loss)	0	0	0	(6)	0	0	(6)
Pension liability adjustments	0	0	0	(2)	0	0	(2)
Distributions			0	0	0	(2,387)	(2,387)
Balance at Dec. 31, 2015	65	13	3,229	37	(128,362)	635	(124,383)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income			0	0	(7,175)	3,506	(3,669)
Foreign currency translation gain (loss)			0	(12)	0	0	(12)
Pension liability adjustments							0
Distributions			0	0	0	(1,912)	(1,912)
Balance at Dec. 31, 2016	65	13	3,229	25	(135,537)	2,229	(129,976)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income			0	0	(5,833)	2,335	(3,498)
Gain on extinguishment of subordinated debt				0	0	0	1,031
Stock-based compensation				0	0	0	50
Foreign currency translation gain (loss)			0	7	0	0	7
Pension liability adjustments							0
Distributions			0	0	0	(3,651)	(3,651)
Balance at Dec. 31, 2017	$ 65	$ 13	$ 4,310	$ 32	$ (141,370)	$ 913	$ (136,037)