Bankruptcy Proceedings, Emergence and Fresh Start Accounting Pre-Petition Agreements (Details) - USD ($) $ in Thousands	Sep. 12, 2016	May 11, 2016	May 10, 2016
Debt Instrument [Line Items]
Percentage of Common Stock Holders agreed to RSA	86.00%
Liabilities Subject to Compromise, Senior Notes	$ 1,075,000
Backstop Commitment Agreement, Backstop Commitment	$ 6,022		$ 50,000
Senior Notes Due 2019 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.25%
Senior Notes Due 2020 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.50%