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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
U.S. Government and federally sponsored agency obligations:    
Carrying Amount $ 7,379,290 $ 7,158,242
Fair Value 7,379,290 7,158,242
Investments, Carrying Amount 7,648,030 7,403,467
Investments, Fair Value 153,228 149,792
Separate Account (variable annuity) assets [1] 1,800,722 1,813,557
Separate Account (variable annuity) assets, Fair Value [1] 1,800,722 1,813,557
Investment contract and life policy reserves, embedded derivatives, Carrying Amount 14 0
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure 14 0
Other policyholder funds, embedded derivatives, Carrying Amount 39,021 20,049
Other policyholder funds, embedded derivatives, Fair Value Disclosure 39,021 20,049
Recurring [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 7,091,340 6,893,090
Fair Value 7,091,340 6,893,090
Short-term investments [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Carrying Amount 174,152 142,039
Investments, Fair Value 174,152 142,039
Mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 504,414 535,726
Fair Value 504,414 535,726
Other, including U.S. Treasury Securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 546,111 538,199
Fair Value 546,111 538,199
Municipal bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 1,708,943 1,647,822
Fair Value 1,708,943 1,647,822
Foreign government bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 73,617 59,536
Fair Value 73,617 59,536
Corporate bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 2,779,415 2,834,749
Fair Value 2,779,415 2,834,749
Other mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 1,478,840 1,277,058
Fair Value 1,478,840 1,277,058
Equity securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Carrying Amount 99,797 110,655
Fair Value 99,797 110,655
Other Investment [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Carrying Amount 14,001 12,458
Investments, Fair Value 14,001 12,458
Level 1 [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 280,305 262,560
Investments, Fair Value 0 0
Separate Account (variable annuity) assets, Fair Value [1] 1,800,722 1,813,557
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure 0 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure 0 0
Level 1 [Member] | Recurring [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 24,453 28,381
Level 1 [Member] | Short-term investments [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 169,764 142,039
Level 1 [Member] | Mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Other, including U.S. Treasury Securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 14,258 17,857
Level 1 [Member] | Municipal bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Foreign government bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Corporate bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 10,195 10,524
Level 1 [Member] | Other mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 1 [Member] | Equity securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 86,088 92,140
Level 1 [Member] | Other Investment [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 0 0
Level 2 [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,925,559 6,724,382
Investments, Fair Value 0 0
Separate Account (variable annuity) assets, Fair Value [1] 0 0
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure 14 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure 0 0
Level 2 [Member] | Recurring [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 6,893,467 6,693,415
Level 2 [Member] | Short-term investments [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 4,388 0
Level 2 [Member] | Mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 504,414 535,726
Level 2 [Member] | Other, including U.S. Treasury Securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 531,853 520,342
Level 2 [Member] | Municipal bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,678,564 1,634,194
Level 2 [Member] | Foreign government bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 73,617 59,536
Level 2 [Member] | Corporate bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 2,701,645 2,749,508
Level 2 [Member] | Other mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 1,403,374 1,194,109
Level 2 [Member] | Equity securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 13,703 18,509
Level 2 [Member] | Other Investment [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 14,001 12,458
Level 3 [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 173,426 171,300
Investments, Fair Value 153,228 149,792
Separate Account (variable annuity) assets, Fair Value [1] 0 0
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure 0 0
Other policyholder funds, embedded derivatives, Fair Value Disclosure 39,021 20,049
Level 3 [Member] | Recurring [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 173,420 171,294
Level 3 [Member] | Short-term investments [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value 0 0
Level 3 [Member] | Mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Other, including U.S. Treasury Securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Municipal bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 30,379 13,628
Level 3 [Member] | Foreign government bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 0 0
Level 3 [Member] | Corporate bonds [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 67,575 74,717
Level 3 [Member] | Other mortgage-backed securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 75,466 82,949
Level 3 [Member] | Equity securities [Member]    
U.S. Government and federally sponsored agency obligations:    
Fair Value 6 6
Level 3 [Member] | Other Investment [Member]    
U.S. Government and federally sponsored agency obligations:    
Investments, Fair Value $ 0 $ 0
[1] Separate Account (variable annuity) liabilities are set equal to Separate Account (variable annuity) assets.