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Fair Value of Financial Instruments - Financial Instrument Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Level 1    
Investments    
Other investments $ 0 $ 0
Financial Liabilities    
Investment contract and life policy reserves, fixed annuity contracts 0 0
Investment contract and life policy reserves, account values on life contracts 0 0
Other policyholder funds 0 0
Long-term debt 257,929 248,191
Level 2    
Investments    
Other investments 0 0
Financial Liabilities    
Investment contract and life policy reserves, fixed annuity contracts 0 0
Investment contract and life policy reserves, account values on life contracts 0 0
Other policyholder funds 575,475 575,253
Long-term debt 0 0
Level 3    
Investments    
Other investments 157,530 156,536
Financial Liabilities    
Investment contract and life policy reserves, fixed annuity contracts 4,288,095 4,280,528
Investment contract and life policy reserves, account values on life contracts 86,175 85,066
Other policyholder funds 69,534 74,304
Long-term debt 0 0
Carrying Amount    
Investments    
Other investments 152,970 151,965
Financial Liabilities    
Investment contract and life policy reserves, fixed annuity contracts 4,377,759 4,360,456
Investment contract and life policy reserves, account values on life contracts 80,768 79,591
Other policyholder funds 645,009 649,557
Long-term debt 247,337 247,209
Fair Value    
Investments    
Other investments 157,530 156,536
Financial Liabilities    
Investment contract and life policy reserves, fixed annuity contracts 4,288,095 4,280,528
Investment contract and life policy reserves, account values on life contracts 86,175 85,066
Other policyholder funds 645,009 649,557
Long-term debt $ 257,929 $ 248,191