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Fair Value Measurement (Financial Instruments Not Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying Value    
Financial assets:    
Other assets $ 39,584 $ 31,128
Financial liabilities:    
Other liabilities 51,456 30,334
Carrying Value | Senior notes due 2023    
Financial liabilities:    
Debt instruments 250,000 250,000
Carrying Value | Mortgage loans    
Financial liabilities:    
Debt instruments 0 36,113
Carrying Value | Contribution Certificates    
Financial liabilities:    
Debt instruments 175,766 0
Carrying Value | BOLI    
Financial assets:    
Short-term and other investments 80,821 67,847
Carrying Value | Other investments    
Financial assets:    
Short-term and other investments 3,170 2,952
Fair Value    
Financial assets:    
Other assets 39,593 31,141
Financial liabilities:    
Other liabilities 51,456 30,334
Fair Value | Senior notes due 2023    
Financial liabilities:    
Debt instruments 267,988 269,160
Fair Value | Mortgage loans    
Financial liabilities:    
Debt instruments 0 36,113
Fair Value | Contribution Certificates    
Financial liabilities:    
Debt instruments 178,728 0
Fair Value | BOLI    
Financial assets:    
Short-term and other investments 80,821 67,847
Fair Value | Other investments    
Financial assets:    
Short-term and other investments $ 3,170 $ 2,952