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Contractual interest rate for funds borrowed, under the debt agreement.

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Total fresh-start adjustment to assets.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Apr. 22, 2016	Dec. 31, 2015	Oct. 03, 2012	Nov. 25, 2009	Jun. 01, 2007
Senior Notes [Member] \| Senior Notes Due 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage						7.125%
Senior Notes [Member] \| Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage					8.875%
Senior Notes [Member] \| Senior Notes Due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage				7.875%
Predecessor [Member] \| Senior Notes [Member] \| Senior Notes Due 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			$ 23,000
Carrying value of senior notes			250,000
Predecessor [Member] \| Senior Notes [Member] \| Senior Notes Due 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			21,400
Carrying value of senior notes			225,000
Predecessor [Member] \| Senior Notes [Member] \| Senior Notes Due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior notes			34,500
Carrying value of senior notes			$ 400,000
Successor [Member] \| Other Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 200
Derivative Liability	200
Successor [Member] \| Natural Gas Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	7,500
Successor [Member] \| Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	2,000
Successor [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Derivative Liability	0
Successor [Member] \| Fair Value, Inputs, Level 1 [Member] \| Natural Gas Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0
Successor [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0
Successor [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	200
Derivative Liability	200
Successor [Member] \| Fair Value, Inputs, Level 2 [Member] \| Natural Gas Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	7,500
Successor [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	2,000
Successor [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0
Derivative Liability	0
Successor [Member] \| Fair Value, Inputs, Level 3 [Member] \| Natural Gas Swap [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0
Successor [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ 0
Fresh Start Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Assets		$ 226,695