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Assets Held-for-Sale and Discontinued Operations Disc Ops (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Income (loss) from discontinued operations |  |  |  |  |
Income (loss) from Oil and Gas discontinued operations, net of tax | $ (15,504) | $ (984) | $ (15,943) | $ (1,910) |
Litigation amount as per judgment |  |  | 16,500 |  |
Gas transport and processing |  |  |  |  |
Contracts for gas transport and processing |  |  |  |  |
Contractual Obligation | 14,300 |  | 14,300 |  | $ 17,200
Gas transport and processing | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Contracts for gas transport and processing |  |  |  |  |
Recorded contractual commitments |  |  | 10,700 |  | 12,500
Gas transport and processing | Disposal Group, Held-for-sale, Not Discontinued Operations | Accrued liabilities |  |  |  |  |
Contracts for gas transport and processing |  |  |  |  |
Recorded contractual commitments |  |  | 5,800 |  | $ 5,500
Oil and Gas | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income (loss) from discontinued operations |  |  |  |  |
Operating revenues | 2,060 | 384 | 4,094 | 761 |
Income (loss) from discontinued operations | 20 | (1,335) | (570) | (2,661) |
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets (2) | 16,539 |  | 16,559 |  |
Less: Income tax expense (benefit) | (1,015) | (351) | (1,186) | (751) |
Income (loss) from Oil and Gas discontinued operations, net of tax | $ (15,504) | $ (984) | $ (15,943) | $ (1,910) |

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