Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2015	$ 299,756	$ 357	$ 71	$ 381,659	$ (1,174)	$ (81,424)	$ (96)	$ 363
Beginning balances, shares at Dec. 31, 2015		35,759	70,613,642				29,990
Vesting of restricted stock units, shares			250,859
Stock-based compensation	1,249			1,249
Conversion of preferred stock to common stock		$ (6)		6
Conversion of preferred stock to common stock, shares		(586)	976
Exercise of SARs, shares			9,740
Net income (loss)	(2,077)					(2,096)		19
Foreign currency translation adjustments	501				514			(13)
Ending balances at Mar. 31, 2016	299,429	$ 351	$ 71	382,914	(660)	(83,520)	$ (96)	369
Ending balances, shares at Mar. 31, 2016		35,173	70,875,217				29,990
Beginning balances at Dec. 31, 2016	281,868	$ 364	$ 71	386,920	(1,089)	(104,949)	$ (96)	647
Beginning balances, shares at Dec. 31, 2016		36,466	71,111,863				29,990
Vesting of restricted stock units	1		$ 1
Vesting of restricted stock units, shares			554,469
Stock-based compensation	1,498			1,498
Exercise of SARs, shares			29,470
Net income (loss)	(3,301)					(3,343)		42
Foreign currency translation adjustments	196				202			(6)
Ending balances at Mar. 31, 2017	$ 280,262	$ 364	$ 72	$ 388,418	$ (887)	$ (108,292)	$ (96)	$ 683
Ending balances, shares at Mar. 31, 2017		36,466	71,695,802				29,990