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Assets Held-for-Sale and Discontinued Operations Disc Ops (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Discontinued operations |  |  |  |  |
Current liability to discontinued operations | $ 5,457 |  | $ 5,457 |  | $ 6,074
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |
Income (loss) from Oil and Gas discontinued operations, net of tax | (584) | $ (15,504) | (659) | $ (15,943) |
Litigation expenses and reserves | 4,677 | 789 | 8,277 | 1,610 |
Gas transport and processing | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Discontinued operations |  |  |  |  |
Undiscounted contractual commitments | 7,000 |  | 7,000 |  | 11,200
Liability related to discontinued operation | 5,500 |  | 5,500 |  | 8,500
Gas transport and processing | Disposal Group, Held-for-sale, Not Discontinued Operations | Accrued liabilities |  |  |  |  |
Discontinued operations |  |  |  |  |
Current liability to discontinued operations |  |  |  |  | $ 6,100
Oil and Gas |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |
Litigation expenses and reserves |  |  | 16,500 |  |
Oil and Gas | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |
Operating revenues | 973 | 2,060 | 2,616 | 4,094 |
Income (loss) from discontinued operations | (723) | 20 | (1,175) | (570) |
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets (2) | 115 | 16,539 | 151 | 16,559 |
Less: Income tax expense (benefit) | (254) | (1,015) | (667) | (1,186) |
Income (loss) from Oil and Gas discontinued operations, net of tax | $ (584) | $ (15,504) | $ (659) | $ (15,943) |

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