Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Changes in uncertain income tax positions | ||
| Balance, beginning of year | $ 334,254 | $ 303,583 |
| Increases in tax positions for prior years | 65,099 | 14,530 |
| Increases in tax positions for current years | 14,594 | 16,141 |
| Decreases in tax positions for prior years | (26,798) | 0 |
| Balance, end of year | $ 387,149 | $ 334,254 |
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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