DEBT - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 1,427,784	$ 1,060,955
Less: current portion of long-term debt	(408)	0
Less: liabilities subject to compromise	(1,075,000)	0
Long-term debt	352,376	1,060,955
Notes Due Two Thousand Seventeen | Convertible Debt
Debt Instrument [Line Items]
Liabilities Subject to Compromise, Debt and Accrued Interest	$ 300,000
Interest rate	1.75%
Total debt		279,244
Less: liabilities subject to compromise	$ (300,000)
Notes Due Two Thousand Twenty Two | Senior Notes
Debt Instrument [Line Items]
Interest rate	7.50%
Total debt	$ 775,000	770,009
Less: liabilities subject to compromise	(775,000)
Bank Debt | Line of Credit | Revolving credit facility
Debt Instrument [Line Items]
Total debt	$ 341,500	0
Building Loan | Secured Debt
Debt Instrument [Line Items]
Interest rate	4.20%
Total debt	$ 11,284	$ 11,702