Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
|
| Related Party Transaction [Line Items] | |||
| Services and other revenues | $ 617,638 | $ 565,861 | |
| Reinsurance recoverables | 9,575,066 | $ 9,235,501 | |
| Premiums ceded | 1,708,362 | 1,218,234 | |
| Nephila Reinsurers [Member] | |||
| Related Party Transaction [Line Items] | |||
| Reinsurance recoverables | 785,900 | 794,300 | |
| Hagerty, Inc. [Member] | |||
| Related Party Transaction [Line Items] | |||
| Reinsurance recoverables | 225,300 | $ 214,800 | |
| Gross premium volume | 198,282 | 164,971 | |
| Premiums ceded | 152,685 | 124,628 | |
| Insurance-linked Securities Operations [Member] | Unconsolidated entities managed by Nephila [Member] | |||
| Related Party Transaction [Line Items] | |||
| Services and other revenues | 19,200 | 9,800 | |
| Program services and other fronting [Member] | Nephila Reinsurers [Member] | |||
| Related Party Transaction [Line Items] | |||
| Gross premium volume | 353,100 | 236,900 | |
| Premiums ceded | $ 353,100 | $ 236,900 | |