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Assets Held-for-Sale and Discontinued Operations (Details 2) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Oil and Gas | Jun. 30, 2012 Oil and Gas | Jun. 30, 2013 Oil and Gas | Jun. 30, 2012 Oil and Gas | Jul. 31, 2013 Oil and Gas United States | Jun. 30, 2013 Rig Services | Jun. 30, 2012 Rig Services | Jun. 30, 2013 Rig Services | Jun. 30, 2012 Rig Services | Apr. 02, 2013 Rig Services
Condensed Statements of Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues and Earnings (losses) from unconsolidated affiliates |  |  |  |  |  | $ 12,050,000 | $ 2,919,000 | $ 22,039,000 | $ 6,220,000 |  | $ 934,000 | $ 5,554,000 | $ 4,971,000 | $ 10,416,000 |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations |  |  |  |  |  | (4,742,000) | (2,791,000) | (2,672,000) | (8,279,000) |  | 6,905,000 | (4,149,000) | 9,823,000 | (5,505,000) |
Impairment charges or other gains and losses on sale of assets |  |  |  |  |  | (40,193,000) | 41,597,000 | (42,193,000) | 36,468,000 |  | 1,382,000 | (5,283,000) | 1,129,000 | (5,256,000) |
Less: income tax expense (benefit) |  |  |  |  |  | (10,715,000) | 7,042,000 | (10,692,000) | 4,227,000 |  | 2,071,000 | (2,358,000) | 2,737,000 | (2,694,000) |
Income (loss) from discontinued operations, net of tax | (28,004,000) | 24,690,000 | (25,958,000) | 15,895,000 |  | (34,220,000) | 31,764,000 | (34,173,000) | 23,962,000 |  | 6,216,000 | (7,074,000) | 8,215,000 | (8,067,000) |
Sale of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  | 9,300,000
Undiscounted contractual commitments | 290,000,000 |  | 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Liability related to discontinue operation | 177,000,000 |  | 177,000,000 |  | 206,000,000 |  |  |  |  |  |  |  |  |  |
Current liability to discontinued operations | $ 57,737,000 |  | $ 57,737,000 |  | $ 68,961,000 |  |  |  |  |  |  |  |  |  |

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