FRESH START ACCOUNTING - Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Feb. 28, 2017
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	$ 0
Liabilities subject to compromise of the Predecessor Company	$ 0
Revaluation of Liabilities
Fresh-Start Adjustment [Line Items]
Accrued interest		$ 35,182
Liabilities subject to compromise of the Predecessor Company		1,110,182
Cash payment to senior noteholders		(100,000)
Issuance of 2022 Second Lien Notes to former holders of the senior notes		(225,000)
Gain on settlement of liabilities subject to compromise		230,554
Common Stock | Revaluation of Liabilities
Fresh-Start Adjustment [Line Items]
Equity fair value adjustments		(538,980)
Warrant
Fresh-Start Adjustment [Line Items]
Equity fair value adjustments		$ (15,648)
Convertible Debt | 1 ¾% Senior Convertible Notes due 2017
Fresh-Start Adjustment [Line Items]
Interest rate		1.75%
Convertible Debt | 1 ¾% Senior Convertible Notes due 2017 | Revaluation of Liabilities
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise		$ 300,000
Senior Notes | 7 ½% Senior Notes due 2022
Fresh-Start Adjustment [Line Items]
Interest rate		7.50%
Senior Notes | 7 ½% Senior Notes due 2022 | Revaluation of Liabilities
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise		$ 775,000