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, 2018		35,687,000	6,604,000
Beginning balance at Dec. 31, 2018	$ 847,721	$ 36	$ 88,516	$ 1,055,164	$ (295,995)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	1,073			1,073
Issuance of warrants for general unsecured claims (in shares)			1,000
Issuance of warrants for general unsecured claims			$ 2	(2)
Net loss	(5,277)				(5,277)
Ending balance (in shares) at Mar. 31, 2019		35,687,000	6,605,000
Ending balance at Mar. 31, 2019	843,460	$ 36	$ 88,518	1,056,235	(301,329)
Beginning balance (in shares) at Dec. 31, 2018		35,687,000	6,604,000
Beginning balance at Dec. 31, 2018	847,721	$ 36	$ 88,516	1,055,164	(295,995)
Increase (Decrease) in Stockholders' Equity
Net loss	(18,561)
Ending balance (in shares) at Jun. 30, 2019		35,762,000	6,605,000
Ending balance at Jun. 30, 2019	$ 832,141	$ 36	$ 88,518	1,058,200	(314,613)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning balance (in shares) at Mar. 31, 2019		35,687,000	6,605,000
Beginning balance at Mar. 31, 2019	$ 843,460	$ 36	$ 88,518	1,056,235	(301,329)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	2,170			2,170
Cash paid for tax withholdings on vested stock awards	(205)			(205)
Issuance of stock awards, net of cancellations (in shares)		75,000
Net loss	(13,284)				(13,284)
Ending balance (in shares) at Jun. 30, 2019		35,762,000	6,605,000
Ending balance at Jun. 30, 2019	$ 832,141	$ 36	$ 88,518	1,058,200	(314,613)
Beginning balance (in shares) at Dec. 31, 2019	35,772,000	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 withholdings on vested stock awards	(1)			(1)
Net 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	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 loss	$ (228,449)
Ending balance (in shares) at Jun. 30, 2020	35,865,000	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
Stock-based compensation	583			583
Cash paid for tax withholdings on vested stock awards	(1)			(1)
Issuance of stock awards, net of cancellations (in shares)		55,000
Net loss	$ (215,779)				(215,779)
Ending balance (in shares) at Jun. 30, 2020	35,865,000	35,865,000	6,706,000
Ending balance at Jun. 30, 2020	$ 174,769	$ 36	$ 88,520	$ 1,060,019	$ (973,806)