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, 2018	$ 274,827	$ 118	$ 286,281	$ (1,870)	$ (9,702)
Purchase of treasury shares	(260)	0	0	(260)	0
Issuance of restricted stock	0	0	0	0	0
Amortization of share-based compensation	1,849	0	1,849	0	0
Net Income (Loss)	16,053	0	0	0	16,053
Ending Balance at Mar. 31, 2019	292,469	118	288,130	(2,130)	6,351
Beginning Balance at Dec. 31, 2018	274,827	118	286,281	(1,870)	(9,702)
Net Income (Loss)	108,408
Ending Balance at Sep. 30, 2019	388,386	119	291,754	(2,193)	98,706
Beginning Balance at Mar. 31, 2019	292,469	118	288,130	(2,130)	6,351
Purchase of treasury shares	(58)	0	0	(58)	0
Issuance of restricted stock	0	0	0	0	0
Amortization of share-based compensation	1,769	0	1,769	0	0
Net Income (Loss)	64,704	0	0	0	64,704
Ending Balance at Jun. 30, 2019	358,884	118	289,899	(2,188)	71,055
Purchase of treasury shares	(5)	0	0	(5)	0
Issuance of restricted stock	1	1	0	0	0
Amortization of share-based compensation	1,855	0	1,855	0	0
Net Income (Loss)	27,651	0	0	0	27,651
Ending Balance at Sep. 30, 2019	388,386	119	291,754	(2,193)	98,706
Beginning Balance at Dec. 31, 2019	395,707	119	292,916	(2,282)	104,954
Purchase of treasury shares	(83)	0	0	(83)	0
Issuance of restricted stock	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)	(318,730)
Ending Balance at Sep. 30, 2020	80,602	121	296,629	(2,372)	(213,776)
Beginning Balance at Mar. 31, 2020	391,101	120	294,250	(2,365)	99,096
Stock Issued During Period, Value, Other	0	0	0	0	0
Purchase of treasury shares	(3)	0	0	(3)	0
Issuance of restricted stock	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)
Purchase of treasury shares	(4)	0	0	(4)	0
Issuance of restricted stock	1	1	0	0	0
Amortization of share-based compensation	1,150	0	1,150	0	0
Net Income (Loss)	(6,896)	0	0	0	(6,896)
Ending Balance at Sep. 30, 2020	$ 80,602	$ 121	$ 296,629	$ (2,372)	$ (213,776)