CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock, at cost	Non-controlling interests
Balance (in shares) at Dec. 31, 2019		25,413
Balance at Dec. 31, 2019	$ (21,357)	$ 25,413	$ 133,669	$ 272,026	$ (453,934)	$ 1,469
Increase (Decrease) in Equity
Net loss	(11,545)			(11,650)		105
Distributions to non-controlling interest holders	(311)					(311)
Share-based compensation expense	2,894		2,894
Issuance of restricted share units and restricted shares	0			(4,796)	4,796
Treasury shares withheld for the payment of tax on restricted share unit and restricted share issuances	(1,205)			(3,114)	1,909
Balance (in shares) at Mar. 31, 2020		25,413
Balance at Mar. 31, 2020	(31,524)	$ 25,413	136,563	252,466	(447,229)	1,263
Balance (in shares) at Dec. 31, 2020		25,413
Balance at Dec. 31, 2020	(82,556)	$ 25,413	141,473	190,383	(441,034)	1,209
Increase (Decrease) in Equity
Net loss	(21,915)			(22,002)		87
Distributions to non-controlling interest holders	(1,395)					(1,395)
Share-based compensation expense	1,438		1,438
Issuance of restricted share units and restricted shares	0			(5,905)	5,905
Treasury shares withheld for the payment of tax on restricted share unit and restricted share issuances	(830)			(3,586)	2,756
Balance (in shares) at Mar. 31, 2021		25,413
Balance at Mar. 31, 2021	$ (105,258)	$ 25,413	$ 142,911	$ 158,890	$ (432,373)	$ (99)