FRESH START ACCOUNTING - Reorganization Adjustments - Schedule of Liabilities Subject To Compromise (Details) - USD ($) $ in Thousands		4 Months Ended	5 Months Ended	9 Months Ended
	May 01, 2019	May 01, 2019	Sep. 30, 2019	Sep. 30, 2019	Apr. 30, 2019	Dec. 31, 2018
Reorganizations [Abstract]
Total liabilities subject to compromise	$ 1,061,846	$ 1,061,846	$ 0	$ 0	$ 16,770,266	$ 16,480,256
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)
Payment of contract cure amounts	(15,763)
Payments for settlement of general unsecured claims from escrow account	(5,822)
Payments for fully secured claims and general unsecured claims	(1,990)
Equity issued at emergence to creditors in settlement of Liabilities subject to Compromise	(2,742,471)
Total amounts settled	(8,516,046)
Net gain on settlement of Liabilities subject to compromise	7,192,374	7,192,374	$ 0	$ 0
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
Total reinstated Other long-term liabilities	$ 14,518	$ 14,518