FRESH START ACCOUNTING - Reorganization Adjustments - Cumulative Effect of Emergence (Details) - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended							4 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2019	May 01, 2019	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reorganizations [Abstract]
Gain on settlement of Liabilities subject to compromise	$ 7,192,374										$ 7,192,374	$ 0	$ (275)
Payment of professional fees upon emergence	(11,509)
Payment of success fees upon emergence	(86,065)
Cancellation of unvested stock-based compensation awards	(1,530)
Cancellation of Predecessor prepaid director and officer insurance policy	(2,331)
Write-off of debt issuance and Mandatorily Redeemable Preferred Stock costs incurred at emergence	(8,726)
Total Reorganization items, net	7,082,213	$ (9,497,944)	$ 0	$ 0	$ 0	$ 36,118	$ 42,849	$ 52,475	$ 68,740	$ 192,055	$ (9,461,826)	$ 0	$ 356,119	$ 0
Income tax benefit	102,914
Cancellation of Predecessor Equity	2,074,190
Issuance of Successor Equity to prior equity holders	(27,701)
Net Impact on Accumulated deficit	$ 9,231,616