Divestitures (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Jan. 21, 2016 |
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] | |||
| Cash paid on settlement of contract | $ 11,000 | $ 0 | |
| Loss on settlement of contract | (89,092) | $ 0 | |
| Disposed of by Means Other Than Sales | WTO Properties | |||
| Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] | |||
| Cash paid on settlement of contract | $ 11,000 | ||
| Treating Agreement | Disposed of by Means Other Than Sales | WTO Properties | |||
| Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] | |||
| Contract agreement, term | 30 years | ||
| Cumulative shortfall accrued | $ 111,900 | ||
| Loss on settlement of contract | $ 89,100 | ||