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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 21, 2016 | Mar. 11, 2016 | Oct. 31, 2015 | Aug. 31, 2015 | Jun. 30, 2015 | Jun. 09, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, subjective acceleration clause, period | 30 days |  |  |  |  |  |  |  |
Capitalized costs | $ 846,300 | $ 1,526,484 | $ 1,335,416 |  |  |  |  |  |
Maximum reserves sold from cost center not expected to result in significant alteration (less than) | 25.00% |  |  |  |  |  |  |  |
Natural gas balancing liability | $ 1,500 | 1,400 |  |  |  |  |  |  |
Advertising and promotional costs | 700 | 1,300 | 5,100 |  |  |  |  |  |
Internal Costs |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capitalized costs | $ 45,100 | 55,400 | 74,700 |  |  |  |  |  |
Buildings | Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life | 10 years |  |  |  |  |  |  |  |
Buildings | Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life | 39 years |  |  |  |  |  |  |  |
Equipment | Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life | 3 years |  |  |  |  |  |  |  |
Equipment | Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life | 30 years |  |  |  |  |  |  |  |
Oil And Gas Unproved Properties |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Interest capitalized during period | $ 10,800 | 14,700 | 11,700 |  |  |  |  |  |
Midstream And Corporate Assets |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Interest capitalized during period | $ 3,300 | $ 5,000 | $ 4,900 |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.125% |  |  |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 7.50% |  |  |  |  |  |  |  |
Senior credit facility |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  | $ 900,000
Secured Debt | 8.75% Senior Secured Notes Due 2020 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.75% |  |  |  |  |  |  | 8.75% |
Convertible Debt | 8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.125% | 8.125% |  |  |  | 8.125% | 8.125% |  |
Convertible Debt | 7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 7.50% | 7.50% |  |  |  | 7.50% | 7.50% |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Vesting period (in years) | 4 years |  |  |  |  |  |  |  |
June Amendment | Senior credit facility |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity | $ 500,000 |  |  |  |  |  |  |  |
Subsequent Event | June Amendment | Senior credit facility |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  | $ 340,000 |  |  |  |
Line of credit facility, target borrowing capacity |  |  |  | $ 500,000 |  |  |  |  |

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