FRESH START ACCOUNTING - Reorganization Adjustments - Schedule of Liabilities Subject To Compromise (Details) - USD ($) $ in Thousands		4 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2019	May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2019
Reorganizations [Abstract]
Total liabilities subject to compromise	$ 1,061,846	$ 1,061,846	$ 0	$ 16,480,256	$ 16,770,266
Deferred taxes	(596,850)	(596,850)
Accrued expenses	(551)	(551)
Accounts payable	(3,061)	(3,061)
Finance leases and other debt	(16,867)	(16,867)
Current operating lease liabilities	(31,845)	(31,845)
Noncurrent operating lease liabilities	(398,154)	(398,154)
Other long-term liabilities	(14,518)	(14,518)
Issuance of new debt	(5,750,000)
Payments to cure contracts	(15,763)
Payments for settlement of general unsecured claims from escrow account	5,822
Payments for fully secured and other claim classes at emergence	(1,990)
Equity issued at emergence to creditors in settlement of Liabilities subject to Compromise	(2,742,471)
Total amounts settled	(8,516,046)
Gain on settlement of Liabilities Subject to Compromise	7,192,374	7,192,374	$ 0	$ (275)
Finance leases and other debt, current	6,600	6,600
Finance leases and other debt, noncurrent	10,300	10,300
Reinstatement of long-term asset retirement obligations	3,527	3,527
Reinstatement of non-qualified deferred compensation plan	$ 10,991	$ 10,991