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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying Amount    
U.S. Government and federally sponsored agency obligations:    
Investments $ 7,923,341 $ 7,663,469
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 390 158
Other policyholder funds, embedded derivatives 72,986 59,393
Carrying Amount | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,630,634 7,456,708
Carrying Amount | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 111,488 44,918
Carrying Amount | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 645,402 614,891
Carrying Amount | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Investments 671,020 467,143
Carrying Amount | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,842,204 1,769,397
Carrying Amount | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,177 98,669
Carrying Amount | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,821,703 2,810,221
Carrying Amount | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,550,128 1,696,387
Carrying Amount | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 159,275 141,649
Carrying Amount | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,944 20,194
Fair Value    
U.S. Government and federally sponsored agency obligations:    
Investments 7,923,341 7,663,469
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 390 158
Other policyholder funds, embedded derivatives 72,986 59,393
Fair Value | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,630,634 7,456,708
Fair Value | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 111,488 44,918
Fair Value | Mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 645,402 614,891
Fair Value | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Investments 671,020 467,143
Fair Value | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,842,204 1,769,397
Fair Value | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,177 98,669
Fair Value | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,821,703 2,810,221
Fair Value | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,550,128 1,696,387
Fair Value | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 159,275 141,649
Fair Value | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,944 20,194
Fair Value | Level 1    
U.S. Government and federally sponsored agency obligations:    
Investments 243,322 169,962
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 28,282 27,163
Fair Value | Level 1 | Short-term investments    
U.S. Government and federally sponsored agency obligations:    
Investments 111,488 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 13,484 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 14,798 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 103,552 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 7,414,938 7,281,403
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 390 158
Other policyholder funds, embedded derivatives 0 0
Fair Value | Level 2 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 7,337,277 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 642,110 611,476
Fair Value | Level 2 | Other, including U.S. Treasury securities    
U.S. Government and federally sponsored agency obligations:    
Investments 657,536 453,512
Fair Value | Level 2 | Municipal bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 1,792,992 1,722,900
Fair Value | Level 2 | Foreign government bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 100,177 98,669
Fair Value | Level 2 | Corporate bonds    
U.S. Government and federally sponsored agency obligations:    
Investments 2,712,660 2,736,498
Fair Value | Level 2 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 1,431,802 1,595,143
Fair Value | Level 2 | Equity securities    
U.S. Government and federally sponsored agency obligations:    
Investments 55,717 43,011
Fair Value | Level 2 | Other investments    
U.S. Government and federally sponsored agency obligations:    
Investments 21,944 20,194
Fair Value | Level 3    
U.S. Government and federally sponsored agency obligations:    
Investments 265,081 212,104
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 0 0
Other policyholder funds, embedded derivatives 72,986 59,393
Fair Value | Level 3 | Recurring    
U.S. Government and federally sponsored agency obligations:    
Investments 265,075 211,347
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 3,292 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 49,212 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 94,245 60,191
Fair Value | Level 3 | Other mortgage-backed securities    
U.S. Government and federally sponsored agency obligations:    
Investments 118,326 101,244
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