Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2019	$ 237,516	$ 406	$ 78	$ 447,681	$ (1,013)	$ (210,942)		$ 1,306
Beginning balances, shares at Dec. 31, 2019		40,624	78,062,451
Vesting of restricted stock units, shares			421,642
Stock-based compensation	1,775			1,775
Common stock repurchasedunder share repurchase program	$ (2,527)			(25)			$ (2,502)
Common stock repurchased under share repurchase program, Shares	(836,904)						836,904
Exercise of SARs, shares			41,091
Net income (loss)	$ (6,837)					(6,975)		138
Foreign currency translation adjustments	63				106			(43)
Ending balances at Mar. 31, 2020	229,990	$ 406	$ 78	449,431	(907)	(217,917)	$ (2,502)	1,401
Ending balances, shares at Mar. 31, 2020		40,624	78,525,184				836,904
Beginning balances at Dec. 31, 2020	209,415	$ 406	$ 78	451,327	1,021	(244,882)		1,465
Beginning balances, shares at Dec. 31, 2020		40,624	78,183,806
Vesting of restricted stock units	1		$ 1
Vesting of restricted stock units, shares			1,159,796
Stock-based compensation	1,700			1,700
Common stock issued as payment for MPUs	352			352
Common stock issued as payment for MPUs, shares			47,404
Exercise of SARs, shares			48,801
Net income (loss)	(10,391)					(10,562)		171
Series A convertible preferred stock dividend		$ 12				(12)
Series A convertible preferred stock dividend, shares		(1,220)
Foreign currency translation adjustments	(1,908)				(1,864)			(44)
Ending balances at Mar. 31, 2021	$ 199,169	$ 418	$ 79	$ 453,379	$ (843)	$ (255,456)		$ 1,592
Ending balances, shares at Mar. 31, 2021		41,844	79,439,807