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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
VOBA asset, amortization period | 2 years |  |  |
Decrease in cash inflows from cash flows provided by operating activities | $ (2,137,195) | $ (1,221,701) | $ (1,025,787) |
Increase in cash flows used in investing activities | $ (2,988,644) | $ (2,536,613) | (122,434) |
Accounting Standards Update 2016-15 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in cash inflows from cash flows provided by operating activities |  |  | 20,000 |
Increase in cash flows used in investing activities |  |  | $ 20,000 |
Retained earnings | Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of adoption of new accounting principle in period of adoption |  |  |  | $ 2,213

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