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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Financial Assets    
Fixed maturity securities $ 6,021,983,000 $ 5,791,676,000
Equity securities 90,338,000 101,864,000
Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 718,974,000 724,319,000
Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 374,881,000 458,868,000
Municipal bonds    
Financial Assets    
Fixed maturity securities 1,805,550,000 1,686,203,000
Foreign government bonds    
Financial Assets    
Fixed maturity securities 43,550,000 45,370,000
Corporate bonds    
Financial Assets    
Fixed maturity securities 1,862,440,000 1,581,424,000
Other asset-backed securities    
Financial Assets    
Fixed maturity securities 1,216,588,000 1,295,492,000
Level 3    
Financial Assets    
Equity securities 115,000  
Financial Liabilities    
Other policyholder funds, embedded derivatives 93,619,000  
Level 3 | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 24,461,000  
Level 3 | Municipal bonds    
Financial Assets    
Fixed maturity securities 73,171,000  
Level 3 | Corporate bonds    
Financial Assets    
Fixed maturity securities 126,292,000  
Level 3 | Other asset-backed securities    
Financial Assets    
Fixed maturity securities 175,685,000  
Carrying Amount    
Financial Assets    
Equity securities 90,338,000 101,864,000
Short-term investments 182,670,000 172,667,000
Other investments 23,604,000 25,997,000
Totals 6,318,595,000 6,092,204,000
Separate Account (variable annuity) assets (1) 2,316,900,000 2,490,469,000
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 1,113,000 1,314,000
Other policyholder funds, embedded derivatives 93,619,000 93,733,000
Carrying Amount | Recurring    
Financial Assets    
Fixed maturity securities 6,021,983,000 5,791,676,000
Carrying Amount | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 718,974,000 724,319,000
Carrying Amount | Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 374,881,000 458,868,000
Carrying Amount | Municipal bonds    
Financial Assets    
Fixed maturity securities 1,805,550,000 1,686,203,000
Carrying Amount | Foreign government bonds    
Financial Assets    
Fixed maturity securities 43,550,000 45,370,000
Carrying Amount | Corporate bonds    
Financial Assets    
Fixed maturity securities 1,862,440,000 1,581,424,000
Carrying Amount | Other asset-backed securities    
Financial Assets    
Fixed maturity securities 1,216,588,000 1,295,492,000
Fair Value    
Financial Assets    
Equity securities 90,338,000 101,864,000
Short-term investments 182,670,000 172,667,000
Other investments 23,604,000 25,997,000
Totals 6,318,595,000 6,092,204,000
Separate Account (variable annuity) assets (1) 2,316,900,000 2,490,469,000
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 1,113,000 1,314,000
Other policyholder funds, embedded derivatives 93,619,000 93,733,000
Fair Value | Recurring    
Financial Assets    
Fixed maturity securities 6,021,983,000 5,791,676,000
Fair Value | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 718,974,000 724,319,000
Fair Value | Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 374,881,000 458,868,000
Fair Value | Municipal bonds    
Financial Assets    
Fixed maturity securities 1,805,550,000 1,686,203,000
Fair Value | Foreign government bonds    
Financial Assets    
Fixed maturity securities 43,550,000 45,370,000
Fair Value | Corporate bonds    
Financial Assets    
Fixed maturity securities 1,862,440,000 1,581,424,000
Fair Value | Other asset-backed securities    
Financial Assets    
Fixed maturity securities 1,216,588,000 1,295,492,000
Fair Value | Level 1    
Financial Assets    
Equity securities 35,269,000 49,834,000
Short-term investments 179,651,000 172,667,000
Other investments 0 0
Totals 246,213,000 254,670,000
Separate Account (variable annuity) assets (1) 2,316,900,000 2,490,469,000
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 1 | Recurring    
Financial Assets    
Fixed maturity securities 31,293,000 32,169,000
Fair Value | Level 1 | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 1 | Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 18,520,000 17,699,000
Fair Value | Level 1 | Municipal bonds    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 1 | Foreign government bonds    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 1 | Corporate bonds    
Financial Assets    
Fixed maturity securities 12,773,000 14,470,000
Fair Value | Level 1 | Other asset-backed securities    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 2    
Financial Assets    
Equity securities 54,954,000 51,923,000
Short-term investments 3,019,000 0
Other investments 23,604,000 25,997,000
Totals 5,672,658,000 5,542,356,000
Separate Account (variable annuity) assets (1) 0 0
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 1,113,000 1,314,000
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 2 | Recurring    
Financial Assets    
Fixed maturity securities 5,591,081,000 5,464,436,000
Fair Value | Level 2 | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 694,513,000 711,004,000
Fair Value | Level 2 | Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 356,361,000 441,169,000
Fair Value | Level 2 | Municipal bonds    
Financial Assets    
Fixed maturity securities 1,732,379,000 1,641,912,000
Fair Value | Level 2 | Foreign government bonds    
Financial Assets    
Fixed maturity securities 43,550,000 45,370,000
Fair Value | Level 2 | Corporate bonds    
Financial Assets    
Fixed maturity securities 1,723,375,000 1,463,002,000
Fair Value | Level 2 | Other asset-backed securities    
Financial Assets    
Fixed maturity securities 1,040,903,000 1,161,979,000
Fair Value | Level 3    
Financial Assets    
Equity securities 115,000 107,000
Short-term investments 0 0
Other investments 0 0
Totals 399,724,000 295,178,000
Separate Account (variable annuity) assets (1) 0 0
Financial Liabilities    
Investment contract and policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 93,619,000 93,733,000
Fair Value | Level 3 | Recurring    
Financial Assets    
Fixed maturity securities 399,609,000 295,071,000
Fair Value | Level 3 | Mortgage-backed securities    
Financial Assets    
Fixed maturity securities 24,461,000 13,315,000
Fair Value | Level 3 | Other, including U.S. Treasury securities    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 3 | Municipal bonds    
Financial Assets    
Fixed maturity securities 73,171,000 44,291,000
Fair Value | Level 3 | Foreign government bonds    
Financial Assets    
Fixed maturity securities 0 0
Fair Value | Level 3 | Corporate bonds    
Financial Assets    
Fixed maturity securities 126,292,000 103,952,000
Fair Value | Level 3 | Other asset-backed securities    
Financial Assets    
Fixed maturity securities $ 175,685,000 $ 133,513,000