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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
U.S. Government and federally sponsored agency obligations:    
Fair Value $ 5,791,676 $ 7,515,318
Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 724,319 787,441
Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 458,868 833,542
Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,686,203 2,003,969
Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 45,370 84,904
Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,581,424 2,079,510
Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,295,492 1,725,952
Carrying Amount    
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,092,204 7,765,437
Separate Account (variable annuity) assets 2,490,469 2,001,128
Investment contract and life policy reserves, embedded derivatives 1,314 248
Other policyholder funds, embedded derivatives 93,733 78,700
Carrying Amount | Recurring    
U.S. Government and federally sponsored agency obligations:    
Fair Value 5,791,676 7,515,318
Carrying Amount | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 172,667 122,222
Carrying Amount | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 724,319 787,441
Carrying Amount | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 458,868 833,542
Carrying Amount | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,686,203 2,003,969
Carrying Amount | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 45,370 84,904
Carrying Amount | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,581,424 2,079,510
Carrying Amount | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,295,492 1,725,952
Carrying Amount | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 101,864 111,750
Carrying Amount | Other investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 25,997 16,147
Fair Value    
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,092,204 7,765,437
Separate Account (variable annuity) assets 2,490,469 2,001,128
Investment contract and life policy reserves, embedded derivatives 1,314 248
Other policyholder funds, embedded derivatives 93,733 78,700
Fair Value | Recurring    
U.S. Government and federally sponsored agency obligations:    
Fair Value 5,791,676 7,515,318
Fair Value | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 172,667 122,222
Fair Value | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 724,319 787,441
Fair Value | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 458,868 833,542
Fair Value | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,686,203 2,003,969
Fair Value | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 45,370 84,904
Fair Value | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,581,424 2,079,510
Fair Value | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,295,492 1,725,952
Fair Value | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 101,864 111,750
Fair Value | Other investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 25,997 16,147
Fair Value | Level 1    
U.S. Government and federally sponsored agency obligations:    
Fair Value 254,670 207,198
Separate Account (variable annuity) assets 2,490,469 2,001,128
Investment contract and life policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 1 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Fair Value 32,169 25,572
Fair Value | Level 1 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 172,667 117,296
Fair Value | Level 1 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 1 | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 17,699 13,291
Fair Value | Level 1 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 1 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 1 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 14,470 12,281
Fair Value | Level 1 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 1 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 49,834 64,330
Fair Value | Level 1 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 2    
U.S. Government and federally sponsored agency obligations:    
Fair Value 5,542,356 7,309,750
Separate Account (variable annuity) assets 0 0
Investment contract and life policy reserves, embedded derivatives 1,314 248
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 2 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Fair Value 5,464,436 7,241,262
Fair Value | Level 2 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 4,926
Fair Value | Level 2 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 711,004 784,224
Fair Value | Level 2 | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 441,169 820,251
Fair Value | Level 2 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,641,912 1,956,438
Fair Value | Level 2 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 45,370 84,904
Fair Value | Level 2 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,463,002 1,986,487
Fair Value | Level 2 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,161,979 1,608,958
Fair Value | Level 2 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 51,923 47,415
Fair Value | Level 2 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 25,997 16,147
Fair Value | Level 3    
U.S. Government and federally sponsored agency obligations:    
Fair Value 295,178 248,489
Separate Account (variable annuity) assets 0 0
Investment contract and life policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 93,733 78,700
Fair Value | Level 3 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Fair Value 295,071 248,484
Fair Value | Level 3 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 3 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 13,315 3,217
Fair Value | Level 3 | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 3 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 44,291 47,531
Fair Value | Level 3 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Fair Value | Level 3 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Fair Value 103,952 80,742
Fair Value | Level 3 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 133,513 116,994
Fair Value | Level 3 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Fair Value 107 5
Fair Value | Level 3 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Fair Value $ 0 $ 0