Income Taxes - Components of net income before income taxes (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Components Of Net Income Before Income Taxes [Line Items] | |||
| Net income before income taxes | $ 969,310 | $ 770,614 | $ 640,303 |
| Bermuda | |||
| Components Of Net Income Before Income Taxes [Line Items] | |||
| Net income before income taxes | 0 | 0 | 0 |
| Foreign - Other | |||
| Components Of Net Income Before Income Taxes [Line Items] | |||
| Net income before income taxes | $ 969,310 | $ 770,614 | $ 640,303 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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