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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 6,909 | $ (17,668) | $ 4,257 | $ (50,108) |  |
Net discrete tax (expense) benefit | 2,300 | 3,200 | (2,200) | 2,700 |  |
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months | 25,000 |  | 25,000 |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance | $ 1,608,025 | $ 3,114,931 | $ 1,608,025 | $ 3,114,931 |  | $ 2,179,358
Accounting Standards Update 2016-16 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance |  |  |  |  | $ 9,000 |

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