CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	China	Russia	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) China	Accumulated Other Comprehensive Income (Loss) Russia
Balances at Dec. 31, 2014	$ 776,057			$ 231	$ 59,297	$ 739,498	$ (22,969)
Net loss	(109,544)					(109,544)
Foreign currency translation adjustment	(5,880)						(5,880)
Reclassification of cumulative translation loss (gain) to Net Loss upon sale or substantial liquidation		$ (8,853)	$ 0					$ (8,853)
Comprehensive loss	(124,277)
Tax expense from stock based compensation	(1,768)				(1,768)
Stock granted under restricted stock plan, net	700			2	698
Stock based compensation	6,840				6,840
Shares surrendered by employees to pay taxes	(580)					(580)
Cash dividends ($0.63 per share)	(14,666)					(14,666)
Balances at Dec. 31, 2015	642,306			233	65,067	614,708	(37,702)
Net loss	(80,127)					(80,127)
Foreign currency translation adjustment	3,376						3,376
Reclassification of cumulative translation loss (gain) to Net Loss upon sale or substantial liquidation		0	0
Comprehensive loss	(76,751)
Cumulative effect of change in accounting policy					697	(697)
Stock sold under ATM program	45,564			34	45,530
Stock granted under restricted stock plan, net	480			2	478
Stock based compensation	5,420				5,420
Shares surrendered by employees to pay taxes	(449)					(449)
Balances at Dec. 31, 2016	616,570			269	117,192	533,435	(34,326)
Net loss	(253,116)					(253,116)
Foreign currency translation adjustment	979						$ 979
Reclassification of cumulative translation loss (gain) to Net Loss upon sale or substantial liquidation		$ 0	$ 33,347						$ 33,347
Comprehensive loss	(218,790)
Issuance of warrant	3,870				3,870
Stock granted under restricted stock plan, net	400			2	398
Stock based compensation	4,255				4,255
Shares surrendered by employees to pay taxes	(540)					(540)
Balances at Dec. 31, 2017	$ 405,765			$ 271	$ 125,715	$ 279,779