Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)
Beginning Balance at Dec. 31, 2019	$ 395,707	$ 119	$ 292,916	$ (2,282)	$ 104,954
Purchase of treasury shares	(83)	0	0	(83)	0
Vesting of share-based compensation	0	1	(1)	0	0
Amortization of share-based compensation	1,335	0	1,335	0	0
Net Income (Loss)	(5,858)	0	0	0	(5,858)
Ending Balance at Mar. 31, 2020	391,101	120	294,250	(2,365)	99,096
Beginning Balance at Dec. 31, 2019	395,707	119	292,916	(2,282)	104,954
Net Income (Loss)	(311,834)
Ending Balance at Jun. 30, 2020	86,351	120	295,479	(2,368)	(206,880)
Beginning Balance at Mar. 31, 2020	391,101	120	294,250	(2,365)	99,096
Shares issued from warrant exercise	0	0	0	0	0
Purchase of treasury shares	(3)	0	0	(3)	0
Vesting of share-based compensation	0	0	0	0	0
Amortization of share-based compensation	1,229	0	1,229	0	0
Net Income (Loss)	(305,976)	0	0	0	(305,976)
Ending Balance at Jun. 30, 2020	86,351	120	295,479	(2,368)	(206,880)
Beginning Balance at Dec. 31, 2020	91,033	121	297,712	(2,372)	(204,428)
Purchase of treasury shares	(488)	0	0	(488)	0
Vesting of share-based compensation	0	2	(2)	0	0
Amortization of share-based compensation	1,131	0	1,131	0	0
Net Income (Loss)	28,380	0	0	0	28,380
Ending Balance at Mar. 31, 2021	120,056	123	298,841	(2,860)	(176,048)
Beginning Balance at Dec. 31, 2020	91,033	121	297,712	(2,372)	(204,428)
Net Income (Loss)	8,429
Ending Balance at Jun. 30, 2021	101,238	124	300,088	(2,975)	(195,999)
Beginning Balance at Mar. 31, 2021	120,056	123	298,841	(2,860)	(176,048)
Purchase of treasury shares	(115)	0	0	(115)	0
Vesting of share-based compensation	0	1	(1)	0	0
Amortization of share-based compensation	1,248	0	1,248	0	0
Net Income (Loss)	(19,951)	0	0	0	(19,951)
Ending Balance at Jun. 30, 2021	$ 101,238	$ 124	$ 300,088	$ (2,975)	$ (195,999)