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Chapter 11 Proceedings - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 14, 2016
May 11, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
May 11, 2019
May 11, 2018
May 11, 2017
Restructuring Cost and Reserve [Line Items]                  
Proceeds from borrowings       $ 488,900,000 $ 2,190,000,000        
Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring contract termination period   225 days              
Minimum equity valuation   $ 1,215,000,000              
Minimum equity valuation percent of total equity   90.00%              
Disclosure statement approval period   30 days              
Rights offering period before confirmation date   15 days              
Rights offering period   90 days              
Employee Incentive Plan - Maximum ownership interest issuable (percentage)   10.00%              
Holders of Senior Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Cash payments for prepetition obligations   $ 35,000,000              
Holders of Unsecured Claims | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Cash payments for prepetition obligations   10,000,000              
New Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Maximum borrowing capacity   $ 425,000,000.0              
Term of facility   40 months              
New Credit Facility | Holders of Senior Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Face amount of debt instrument   $ 425,000,000.0              
New Convertible Debt | Convertible Debt | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Term of facility   4 years              
New Convertible Debt | Holders of Senior Secured Notes | Convertible Debt | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Face amount of debt instrument   $ 300,000,000.0              
New Building Note | Secured Notes | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Face amount of debt instrument   $ 35,000,000.0              
Term of facility   5 years              
Term of interest payments   46 months              
Term of interest payments   90 days              
New Common Stock | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Stock to be issued during rights offering period   $ 150,000,000.0              
New Common Stock | Holders of Unsecured Claims | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Percentage of stock to be issued   15.00%              
New Common Stock | Holders of Senior Secured Notes | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Percentage of stock to be issued   85.00%              
New Common Stock | New Convertible Debt | Convertible Debt | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Percentage of stock receivable upon conversion   46.50%              
7.0% Convertible perpetual preferred stock                  
Restructuring Cost and Reserve [Line Items]                  
Preferred stock, dividend rate, percentage     7.00% 7.00% 7.00% 7.00%      
7.0% Convertible perpetual preferred stock | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Preferred stock, dividend rate, percentage   7.00%              
8.5% Convertible perpetual preferred stock                  
Restructuring Cost and Reserve [Line Items]                  
Preferred stock, dividend rate, percentage     8.50% 8.50% 8.50% 8.50%      
8.5% Convertible perpetual preferred stock | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Preferred stock, dividend rate, percentage   8.50%              
LIBOR | New Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Basis spread on variable rate   4.75%              
Variable rate floor   1.00%              
Proved Developed Producing Reserves | New Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Percentage of assets pledged as security   95.00%              
Proved Reserves | New Credit Facility | Revolving Credit Facility | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Percentage of assets pledged as security   95.00%              
Warrant | New Common Stock | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Maximum percent of stock callable by warrants issued   12.50%              
Total equity value of warrants issued   $ 1,625,000,000              
Volume-weighted average price period   30 days              
Warrant expiration   6 years              
Forecast | New Building Note | Secured Notes | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Annual interest rate             10.00% 8.00% 6.00%
Subsequent Event | New Building Note | Holders of Unsecured Claims | Secured Notes | Restructuring Support Agreement                  
Restructuring Cost and Reserve [Line Items]                  
Proceeds from borrowings $ 27,000,000