CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Warrants	Additional Paid-In Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019		35,772,000	6,659,000
Beginning balance at Dec. 31, 2019	$ 402,452	$ 36	$ 88,520	$ 1,059,253	$ (745,357)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	185			185
Issuance of common stock for general unsecured claims (in shares)		38,000
Issuance of warrants for general unsecured claims (in shares)			47,000
Cash paid for tax obligations on vested stock awards	(1)			(1)
Net Income (Loss)	(12,670)				(12,670)
Ending balance (in shares) at Mar. 31, 2020		35,810,000	6,706,000
Ending balance at Mar. 31, 2020	389,966	$ 36	$ 88,520	1,059,437	(758,027)
Beginning balance (in shares) at Dec. 31, 2019		35,772,000	6,659,000
Beginning balance at Dec. 31, 2019	402,452	$ 36	$ 88,520	1,059,253	(745,357)
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)	(228,449)
Ending balance (in shares) at Jun. 30, 2020		35,865,000	6,706,000
Ending balance at Jun. 30, 2020	174,769	$ 36	$ 88,520	1,060,019	(973,806)
Beginning balance (in shares) at Mar. 31, 2020		35,810,000	6,706,000
Beginning balance at Mar. 31, 2020	389,966	$ 36	$ 88,520	1,059,437	(758,027)
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of cancellations (in shares)		55,000
Stock-based compensation	583			583
Cash paid for tax obligations on vested stock awards	(1)			(1)
Net Income (Loss)	(215,779)				(215,779)
Ending balance (in shares) at Jun. 30, 2020		35,865,000	6,706,000
Ending balance at Jun. 30, 2020	$ 174,769	$ 36	$ 88,520	1,060,019	(973,806)
Beginning balance (in shares) at Dec. 31, 2020	35,928,000	35,928,000	6,734,000
Beginning balance at Dec. 31, 2020	$ 128,066	$ 36	$ 88,520	1,062,220	(1,022,710)
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of cancellations (in shares)		6,000
Stock-based compensation	236			236
Issuance of common stock for general unsecured claims (in shares)		201,000
Issuance of warrants for general unsecured claims (in shares)			247,000
Issuance of warrants for general unsecured claims	0		$ 0
Cash paid for tax obligations on vested stock awards	(19)			(19)
Net Income (Loss)	35,043				35,043
Ending balance (in shares) at Mar. 31, 2021		36,135,000	6,981,000
Ending balance at Mar. 31, 2021	$ 163,326	$ 36	$ 88,520	1,062,437	(987,667)
Beginning balance (in shares) at Dec. 31, 2020	35,928,000	35,928,000	6,734,000
Beginning balance at Dec. 31, 2020	$ 128,066	$ 36	$ 88,520	1,062,220	(1,022,710)
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)	$ 51,295
Ending balance (in shares) at Jun. 30, 2021	36,560,000	36,560,000	6,981,000
Ending balance at Jun. 30, 2021	$ 179,568	$ 37	$ 88,520	1,062,426	(971,415)
Beginning balance (in shares) at Mar. 31, 2021		36,135,000	6,981,000
Beginning balance at Mar. 31, 2021	163,326	$ 36	$ 88,520	1,062,437	(987,667)
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of cancellations (in shares)		425,000
Issuance of stock awards, net of cancellations	0	$ 1		(1)
Stock-based compensation	584			584
Cash paid for tax obligations on vested stock awards	(594)			(594)
Net Income (Loss)	$ 16,252				16,252
Ending balance (in shares) at Jun. 30, 2021	36,560,000	36,560,000	6,981,000
Ending balance at Jun. 30, 2021	$ 179,568	$ 37	$ 88,520	$ 1,062,426	$ (971,415)