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Variable Interest Entities and Noncontrolling Interests - Other variable interest entity disclosures (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | $ 45,719,194 | $ 45,100,945
Maximum Exposure to Loss, Total |  | 3,625,167 | 3,248,206
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 3,938,695 | 4,336,596
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (5,125) | (4,434)
Maximum Exposure to Loss - Off-Balance Sheet |  | 34,088 | 42,202
Maximum Exposure to Loss, Total |  | 28,963 | 37,768
Remaining Coverage, Amount |  | 316,457 |
Variable Interest Entity, Not Primary Beneficiary | 2017-1 Ltd. (Oct-17) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 61,328 | 108,368
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (68) | (159)
Maximum Exposure to Loss - Off-Balance Sheet |  | 274 | 424
Maximum Exposure to Loss, Total |  | 206 | 265
Variable Interest Entity, Not Primary Beneficiary | 2018-1 Ltd. (Apr-18) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 122,190 | 181,136
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (342) | (528)
Maximum Exposure to Loss - Off-Balance Sheet |  | 965 | 1,268
Maximum Exposure to Loss, Total |  | 623 | 740
Variable Interest Entity, Not Primary Beneficiary | 2018-3 Ltd. (Oct-18) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 244,257 | 302,563
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (566) | (1,018)
Maximum Exposure to Loss - Off-Balance Sheet |  | 1,522 | 2,496
Maximum Exposure to Loss, Total |  | 956 | 1,478
Variable Interest Entity, Not Primary Beneficiary | 2019-1 Ltd. (Mar-19) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 134,972 | 181,324
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (127) | (380)
Maximum Exposure to Loss - Off-Balance Sheet |  | 988 | 5,807
Maximum Exposure to Loss, Total |  | 861 | 5,427
Variable Interest Entity, Not Primary Beneficiary | 2019-2 Ltd. (Apr-19) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 383,737 | 398,316
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (426) | (515)
Maximum Exposure to Loss - Off-Balance Sheet |  | 5,323 | 3,998
Maximum Exposure to Loss, Total |  | 4,897 | 3,483
Variable Interest Entity, Not Primary Beneficiary | 2019-3 Ltd. (Jul-19) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 296,466 | 409,859
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (282) | (584)
Maximum Exposure to Loss - Off-Balance Sheet |  | 2,154 | 3,190
Maximum Exposure to Loss, Total |  | 1,872 | 2,606
Variable Interest Entity, Not Primary Beneficiary | 2019-4 Ltd. (Oct-19) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 312,668 | 411,954
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (306) | (462)
Maximum Exposure to Loss - Off-Balance Sheet |  | 4,702 | 4,759
Maximum Exposure to Loss, Total |  | 4,396 | 4,297
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-2 Ltd (Sep-20) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 151,543 | 217,766
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (58) | (177)
Maximum Exposure to Loss - Off-Balance Sheet |  | 1,331 | 1,984
Maximum Exposure to Loss, Total |  | 1,273 | 1,807
Remaining Coverage, Amount | [1] | 442 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-3 Ltd |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 303,011 | 348,818
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (26) | (128)
Maximum Exposure to Loss - Off-Balance Sheet |  | 4,388 | 5,793
Maximum Exposure to Loss, Total |  | 4,362 | 5,665
Remaining Coverage, Amount | [1] | 10,779 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2020-4 Ltd |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 124,672 | 176,826
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | 23 | (50)
Maximum Exposure to Loss - Off-Balance Sheet |  | 1,267 | 1,630
Maximum Exposure to Loss, Total |  | 1,290 | 1,580
Remaining Coverage, Amount | [1] | 5,900 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-1 Ltd |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 519,641 | 568,986
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,006) | (303)
Maximum Exposure to Loss - Off-Balance Sheet |  | 2,771 | 3,283
Maximum Exposure to Loss, Total |  | 1,765 | 2,980
Remaining Coverage, Amount | [1] | 48,841 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-2 Ltd. (Jun-21) |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 492,837 | 522,807
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (577) | 281
Maximum Exposure to Loss - Off-Balance Sheet |  | 3,505 | 4,124
Maximum Exposure to Loss, Total |  | 2,928 | 4,405
Remaining Coverage, Amount | [1] | 85,717 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2021-3 Ltd |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 507,873 | 507,873
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (1,082) | (411)
Maximum Exposure to Loss - Off-Balance Sheet |  | 2,878 | 3,446
Maximum Exposure to Loss, Total |  | 1,796 | $ 3,035
Remaining Coverage, Amount | [1] | 131,518 |
Variable Interest Entity, Not Primary Beneficiary | Bellemeade 2022-1 Ltd. |  |  |
Variable Interest Entity [Line Items] |  |  |
Total VIE Assets |  | 283,500 |
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability |  | (282) |
Maximum Exposure to Loss - Off-Balance Sheet |  | 2,020 |
Maximum Exposure to Loss, Total |  | 1,738 |
Remaining Coverage, Amount | [1] | $ 33,260 |
[1] | Coverage from a separate panel of reinsurers remaining at June 30, 2022.

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