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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost $ 5,275,778 $ 6,775,806
Amortized Cost 19,384 54,609
Fair Value 5,631,416 6,840,932
Fair Value 20,102 51,973
Net unrealized gains on impaired securities relating to changes in value of securities subsequent to the impairment measurement date 8,000 9,000
Fixed maturities, available-for-sale    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 5,275,778 6,775,806
Gross Unrealized Gains 386,152 217,935
Gross Unrealized Losses 30,514 152,809
Fair Value 5,631,416 6,840,932
OTTI in AOCI (3,296) (3,963)
Fixed maturities, available-for-sale | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 138,696 87,107
Gross Unrealized Gains 8,087 7,170
Gross Unrealized Losses 407 228
Fair Value 146,376 94,049
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Obligations of U.S. states and their political subdivisions    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 547,351 602,508
Gross Unrealized Gains 51,186 24,219
Gross Unrealized Losses 132 1,958
Fair Value 598,405 624,769
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Foreign government bonds    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 103,613 70,107
Gross Unrealized Gains 8,071 3,094
Gross Unrealized Losses 204 2,791
Fair Value 111,480 70,410
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Public utilities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 701,194 790,038
Gross Unrealized Gains 73,852 30,862
Gross Unrealized Losses 3,103 18,402
Fair Value 771,943 802,498
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Redeemable preferred stock    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 4,836 5,316
Gross Unrealized Gains 1,097 1,530
Gross Unrealized Losses 221 145
Fair Value 5,712 6,701
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | All other U.S. public corporate securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 1,728,113 2,138,358
Gross Unrealized Gains 150,646 81,905
Gross Unrealized Losses 5,967 61,142
Fair Value 1,872,792 2,159,121
OTTI in AOCI (241) (217)
Fixed maturities, available-for-sale | All other U.S. private corporate securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 681,011 1,085,345
Gross Unrealized Gains 33,870 26,299
Gross Unrealized Losses 2,853 13,963
Fair Value 712,028 1,097,681
OTTI in AOCI (236) 0
Fixed maturities, available-for-sale | All other foreign public corporate securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 202,192 270,063
Gross Unrealized Gains 13,617 8,230
Gross Unrealized Losses 1,144 6,508
Fair Value 214,665 271,785
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | All other foreign private corporate securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 574,993 784,283
Gross Unrealized Gains 19,242 9,933
Gross Unrealized Losses 15,815 42,528
Fair Value 578,420 751,688
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Asset-backed securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 189,769 431,578
Gross Unrealized Gains 4,896 6,203
Gross Unrealized Losses 618 2,650
Fair Value 194,047 435,131
OTTI in AOCI (2,535) (3,056)
Fixed maturities, available-for-sale | Commercial mortgage-backed securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 321,990 396,160
Gross Unrealized Gains 16,143 10,614
Gross Unrealized Losses 28 2,429
Fair Value 338,105 404,345
OTTI in AOCI 0 0
Fixed maturities, available-for-sale | Residential mortgage-backed securities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 82,020 114,943
Gross Unrealized Gains 5,445 7,876
Gross Unrealized Losses 22 65
Fair Value 87,443 122,754
OTTI in AOCI (284) (690)
Equity securities, available-for-sale    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 19,384 54,609
Gross Unrealized Gains 901 423
Gross Unrealized Losses 183 3,059
Fair Value 20,102 51,973
Equity securities, available-for-sale | Public utilities    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 66 66
Gross Unrealized Gains 2 2
Gross Unrealized Losses 31 29
Fair Value 37 39
Equity securities, available-for-sale | Industrial, miscellaneous & other    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 121 165
Gross Unrealized Losses 0 0
Fair Value 121 165
Equity securities, available-for-sale | Mutual funds    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 19,318 54,543
Gross Unrealized Gains 778 256
Gross Unrealized Losses 152 3,030
Fair Value 19,944 51,769
Equity securities, available-for-sale | Non-redeemable preferred stocks    
Summary of Investments Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 0 $ 0