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Variable Interest Entities and Noncontrolling Interests - Variable interest entity (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 02, 2019 | Mar. 31, 2014 | Jun. 30, 2020 | Jun. 30, 2019
Variable Interest Entity [Line Items] |  |  |  |
Net cash used for operating activities |  |  | $ 1,321,580 | $ 712,524
Net cash used for investing activities |  |  | (1,810,190) | (746,944)
Net cash provided by financing activities |  |  | $ 671,337 | (9,085)
Variable Interest Entity, Primary Beneficiary | Watford Holdings Ltd |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial investment contribution amount |  | $ 100,000 |  |
Number of shares acquired |  | 2,500,000 |  |
Ownership percentage |  | 11.00% | 13.00% |
Senior notes, face amount | $ 175,000 |  |  |
Senior notes, stated percentage | 6.50% |  |  |
Proceeds from issuance of senior notes | $ 172,400 |  |  |
Senior notes acquired | $ 35,000 |  |  |
Net cash used for operating activities |  |  | $ 87,300 | 115,900
Net cash used for investing activities |  |  | 78,000 | (135,700)
Net cash provided by financing activities |  |  | $ (153,800) | $ 25,600

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