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Assets Held for Sale and Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Undiscounted contractual commitments | $ 11,200 |  |  |  | $ 17,200 |  |  |  | $ 11,200 | $ 17,200 |
Liability related to discontinued operation | 8,500 |  |  |  | 12,500 |  |  |  | 8,500 | 12,500 |
Current liability to discontinued operations | 6,074 |  |  |  | 5,462 |  |  |  | 6,074 | 5,462 |
Operating revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 6,169 | 2,859 | $ 3,212
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Oil and Gas discontinued operations, net of tax | (442) | $ (27,134) | $ (15,504) | $ (439) | (4,266) | $ (12,187) | $ (984) | $ (926) | (43,519) | (18,363) | (42,797)
Litigation expenses and reserves |  |  |  |  |  |  |  |  | 1,273 | 3,936 | 8,194
Sale of business |  |  |  |  |  |  |  |  |  |  |
Other long-term assets | $ 252,854 |  |  |  | $ 230,090 |  |  |  | 252,854 | 230,090 |
Assets Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 35,300 | 15,400 | 51,000
Canada | Assets Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Impairment of note receivable |  |  |  |  |  |  |  |  |  | 3,100 |
Oil and Gas |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | (2,506) | (3,978) | (5,003)
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets (2) |  |  |  |  |  |  |  |  | 51,028 | 19,445 | 49,890
Less: Income tax expense (benefit) |  |  |  |  |  |  |  |  | (10,015) | (5,060) | (14,455)
Income (loss) from Oil and Gas discontinued operations, net of tax |  |  |  |  |  |  |  |  | (43,519) | $ (18,363) | (40,438)
Litigation expenses and reserves |  |  |  |  |  |  |  |  | $ 16,500 |  |
Rig Technologies |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Oil & Gas discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Less: Impairment charges or other (gains) and losses on sale of wholly owned assets (2) |  |  |  |  |  |  |  |  |  |  | 3,146
Less: Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | (787)
Income (loss) from Oil and Gas discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | $ (2,359)

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