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Investments - Provision for Credit Losses (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]  
Write-offs charged against allowance $ 3,700
Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Origination for gross loan and financing receivables in 2022 0
Origination for gross loan and financing receivables in 2021 35,700
Origination for gross loan and financing receivables in 2020 0
Origination for gross loan and financing receivables in 2019 121,900
Origination for gross loan and financing receivables in 2018 0
Origination for gross loan and financing receivables in prior to 2018 12,400
Non Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Origination for gross loan and financing receivables in 2022 73,800
Origination for gross loan and financing receivables in 2021 77,100
Origination for gross loan and financing receivables in 2020 94,200
Origination for gross loan and financing receivables in 2019 113,100
Origination for gross loan and financing receivables in 2018 31,300
Origination for gross loan and financing receivables in prior to 2018 166,000
ASU 2016-13  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Provision for credit losses 300
Write-offs charged against allowance 3,700
Recoveries of amounts previously written off 0
ASU 2016-13 | Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Loans and financing receivables 170,000
ASU 2016-13 | Non Investment Grade  
Financing Receivable, Allowance for Credit Loss [Line Items]  
Loans and financing receivables $ 555,500