CHAPTER 11 PROCEEDINGS - Summary of Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Debt and accrues interest payable	$ 1,075,000	$ 0
Accrued interest payable	35,182
Liabilities subject to compromise	1,110,182	$ 0
Notes Due Two Thousand Seventeen | Convertible Debt
Restructuring Cost and Reserve [Line Items]
Debt and accrues interest payable	300,000
Notes Due Two Thousand Twenty Two | Senior Notes
Restructuring Cost and Reserve [Line Items]
Debt and accrues interest payable	$ 775,000