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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost $ 6,775,806 $ 5,866,873
Fixed maturities, available-for-sale: 6,840,932 6,194,564
Amortized Cost 54,609 28,881
Fair Value 51,973 29,500
Net unrealized gains on impaired securities relating to changes in value of securities subsequent to the impairment measurement date 9,000 10,000
Fixed maturities, available-for-sale    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 6,775,806 5,866,873
Gross Unrealized Gains 217,935 355,241
Gross Unrealized Losses 152,809 27,550
Fixed maturities, available-for-sale: 6,840,932 6,194,564
OTTI in AOCI (3,963) (4,614)
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 87,107 83,372
Gross Unrealized Gains 7,170 8,711
Gross Unrealized Losses 228 1
Fixed maturities, available-for-sale: 94,049 92,082
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 602,508 310,518
Gross Unrealized Gains 24,219 15,323
Gross Unrealized Losses 1,958 187
Fixed maturities, available-for-sale: 624,769 325,654
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 70,107 35,228
Gross Unrealized Gains 3,094 3,284
Gross Unrealized Losses 2,791 14
Fixed maturities, available-for-sale: 70,410 38,498
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 790,038 683,652
Gross Unrealized Gains 30,862 62,060
Gross Unrealized Losses 18,402 3,288
Fixed maturities, available-for-sale: 802,498 742,424
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 5,316 3,185
Gross Unrealized Gains 1,530 763
Gross Unrealized Losses 145 137
Fixed maturities, available-for-sale: 6,701 3,811
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 2,138,358 2,042,843
Gross Unrealized Gains 81,905 143,969
Gross Unrealized Losses 61,142 10,280
Fixed maturities, available-for-sale: 2,159,121 2,176,532
OTTI in AOCI (217) (247)
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 1,085,345 983,361
Gross Unrealized Gains 26,299 47,266
Gross Unrealized Losses 13,963 2,106
Fixed maturities, available-for-sale: 1,097,681 1,028,521
OTTI in AOCI 0 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 270,063 182,884
Gross Unrealized Gains 8,230 12,468
Gross Unrealized Losses 6,508 1,019
Fixed maturities, available-for-sale: 271,785 194,333
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 784,283 534,716
Gross Unrealized Gains 9,933 24,236
Gross Unrealized Losses 42,528 7,415
Fixed maturities, available-for-sale: 751,688 551,537
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 431,578 395,180
Gross Unrealized Gains 6,203 8,281
Gross Unrealized Losses 2,650 1,210
Fixed maturities, available-for-sale: 435,131 402,251
OTTI in AOCI (3,056) (3,531)
Fixed maturities, available-for-sale | Commercial mortgage-backed securities    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 396,160 482,769
Gross Unrealized Gains 10,614 17,978
Gross Unrealized Losses 2,429 1,868
Fixed maturities, available-for-sale: 404,345 498,879
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 114,943 129,165
Gross Unrealized Gains 7,876 10,902
Gross Unrealized Losses 65 25
Fixed maturities, available-for-sale: 122,754 140,042
OTTI in AOCI (690) (836)
Equity securities, available-for-sale    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 54,609 28,881
Gross Unrealized Gains 423 914
Gross Unrealized Losses 3,059 295
Fair Value 51,973 29,500
Equity securities, available-for-sale | Mutual funds    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 54,543 28,470
Gross Unrealized Gains 256 468
Gross Unrealized Losses 3,030 295
Fair Value 51,769 28,643
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 23
Gross Unrealized Losses 29 0
Fair Value 39 89
Equity securities, available-for-sale | Industrial, miscellaneous & other    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 0 5
Gross Unrealized Gains 165 173
Gross Unrealized Losses 0 0
Fair Value 165 178
Equity securities, available-for-sale | Non-redeemable preferred stocks    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Amortized Cost 0 340
Gross Unrealized Gains 0 250
Gross Unrealized Losses 0 0
Fair Value $ 0 $ 590