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Allowance for Expected Credit Losses - Contractholder receivables (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Credit Loss [Abstract]  
Balance at beginning of period $ 2,119,460
Balance at end of period 2,140,724
Allowance for Expected Credit Losses  
Balance at beginning of period 0
Cumulative effect of accounting change (1) 6,663
Additions for current-period provision for expected credit losses 2,375
Write-offs charged against the allowance 0
Balance at end of period $ 9,038