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Supplemental Balance Sheet and Income Statement Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income |  |  |  |
Impairments and other charges | $ 102,570 | $ 69,620 | $ 99,903 | $ 76,664
Interest expense | 51,491 | 60,592 | 103,843 | 121,978
General and administrative expenses | 64,415 | 67,823 | 132,582 | 142,394
Income (loss) from continuing operations before income taxes | (181,403) | (171,937) | (254,980) | (291,979)
Income tax expense (benefit) | 11,398 | 23,278 | 41,197 | 46,823
Net income (loss) | (192,835) | (195,799) | (296,368) | (339,461)
Reclassification adjustment for (gains)/losses included in net income (loss) |  |  |  |
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income |  |  |  |
Interest expense | 142 | 142 | 282 | 282
General and administrative expenses | 54 | 54 | 108 | 108
Income (loss) from continuing operations before income taxes | (196) | (196) | (390) | (390)
Income tax expense (benefit) | (48) | (48) | (94) | (91)
Net income (loss) | $ (148) | $ (148) | $ (296) | $ (299)

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