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Debt and Credit Facilities - Credit Facilities (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Line of Credit Facility [Line Items]  
Available letter of credit and revolving loan facilities - commitments $ 924,491
Available letter of credit and revolving loan facilities - in use 634,977
TS Hamilton Fund  
Line of Credit Facility [Line Items]  
Security pledged under letter of credit and revolving loan facilities: 214,437
Fixed Income Portfolio  
Line of Credit Facility [Line Items]  
Security pledged under letter of credit and revolving loan facilities: 216,696
Cash  
Line of Credit Facility [Line Items]  
Security pledged under letter of credit and revolving loan facilities: $ 6,847