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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Carrying Amount    
U.S. Government and federally sponsored agency obligations:    
Investments $ 7,861,063 $ 7,663,469
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 286 158
Other policyholder funds, embedded derivatives 67,995 59,393
Carrying Amount | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,578,585 7,456,708
Carrying Amount | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 104,087 44,918
Carrying Amount | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 623,064 614,891
Carrying Amount | Other, including U.S. Treasury Securities    
U.S. Government and federally sponsored agency obligations:    
Investments 606,350 467,143
Carrying Amount | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,817,220 1,769,397
Carrying Amount | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,046 98,669
Carrying Amount | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,827,608 2,810,221
Carrying Amount | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,604,297 1,696,387
Carrying Amount | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 156,909 141,649
Carrying Amount | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,482 20,194
Fair Value    
U.S. Government and federally sponsored agency obligations:    
Investments 7,861,063 7,663,469
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 286 158
Other policyholder funds, embedded derivatives 67,995 59,393
Fair Value | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,578,585 7,456,708
Fair Value | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 104,087 44,918
Fair Value | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 623,064 614,891
Fair Value | Other, including U.S. Treasury Securities    
U.S. Government and federally sponsored agency obligations:    
Investments 606,350 467,143
Fair Value | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,817,220 1,769,397
Fair Value | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,046 98,669
Fair Value | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,827,608 2,810,221
Fair Value | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,604,297 1,696,387
Fair Value | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 156,909 141,649
Fair Value | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,482 20,194
Fair Value | Level 1    
U.S. Government and federally sponsored agency obligations:    
Investments 235,251 169,962
Financial Liabilities    
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:    
Investments 29,317 27,163
Fair Value | Level 1 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 104,087 44,167
Fair Value | Level 1 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 1 | Other, including U.S. Treasury Securities    
U.S. Government and federally sponsored agency obligations:    
Investments 14,341 13,631
Fair Value | Level 1 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 1 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 1 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 14,976 13,532
Fair Value | Level 1 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 1 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 101,847 98,632
Fair Value | Level 1 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 2    
U.S. Government and federally sponsored agency obligations:    
Investments 7,379,307 7,281,403
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 286 158
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 2 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,302,769 7,218,198
Fair Value | Level 2 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 2 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 619,479 611,476
Fair Value | Level 2 | Other, including U.S. Treasury Securities    
U.S. Government and federally sponsored agency obligations:    
Investments 592,009 453,512
Fair Value | Level 2 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,768,097 1,722,900
Fair Value | Level 2 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,046 98,669
Fair Value | Level 2 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,735,580 2,736,498
Fair Value | Level 2 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,487,558 1,595,143
Fair Value | Level 2 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 55,056 43,011
Fair Value | Level 2 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,482 20,194
Fair Value | Level 3    
U.S. Government and federally sponsored agency obligations:    
Investments 246,505 212,104
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 67,995 59,393
Fair Value | Level 3 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 246,499 211,347
Fair Value | Level 3 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 0 751
Fair Value | Level 3 | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 3,585 3,415
Fair Value | Level 3 | Other, including U.S. Treasury Securities    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 3 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 49,123 46,497
Fair Value | Level 3 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 0 0
Fair Value | Level 3 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 77,052 60,191
Fair Value | Level 3 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 116,739 101,244
Fair Value | Level 3 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 6 6
Fair Value | Level 3 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments $ 0 $ 0