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Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income |  |  |  |  |  |  |  |  |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | $ 1,183 | $ 2,308 | $ 11,831
Impairment and other charges |  |  |  |  |  |  |  |  | 505,164 | 368,967 | 1,005,110
Interest expense |  |  |  |  |  |  |  |  | 185,360 | 181,928 | 177,948
General and administrative expenses |  |  |  |  |  |  |  |  | 227,639 | 324,328 | 500,036
Other expense (income), net |  |  |  |  |  |  |  |  | 37,509 | (39,172) | 31,386
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (1,198,075) | (427,535) | (604,615)
Tax expense (benefit) |  |  |  |  |  |  |  |  | 186,831 | 98,038 | (62,666)
Net income (loss) | $ (334,462) | $ (110,026) | $ (187,549) | $ (397,570) | $ (162,820) | $ (296,154) | $ (36,865) | $ 123,545 | (1,029,607) | (372,294) | (669,244)
Reclassification adjustment for (gains)/losses included in net income (loss) |  |  |  |  |  |  |  |  |  |  |
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income |  |  |  |  |  |  |  |  |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  |  |  | 4,635
Impairment and other charges |  |  |  |  |  |  |  |  | 3,495 |  | 6,972
Interest expense |  |  |  |  |  |  |  |  | 613 | 613 | 614
General and administrative expenses |  |  |  |  |  |  |  |  | 1,061 | 1,104 | 303
Other expense (income), net |  |  |  |  |  |  |  |  | 3,059 | 5,365 |
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (8,228) | (7,082) | (3,254)
Tax expense (benefit) |  |  |  |  |  |  |  |  | 1,551 | 648 | (552)
Net income (loss) |  |  |  |  |  |  |  |  | $ (6,677) | $ (6,434) | $ (3,806)

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