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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost $ 8,713,464 $ 2,433,626
Amortized Cost 14 14
Fair Value 9,157,320 2,524,272
Fair Value 18 17
Net unrealized gains (losses) on impaired securities relating to changes in value of securities subsequent to the impairment measurement date (100) 100
Fixed maturities, available-for-sale    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 8,713,464 2,433,626
Gross Unrealized Gains 467,514 125,359
Gross Unrealized Losses 23,658 34,713
Fair Value 9,157,320 2,524,272
OTTI in AOCI (716) (42)
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 3,626,086 12,233
Gross Unrealized Gains 208,833 28
Gross Unrealized Losses 8 107
Fair Value 3,834,911 12,154
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 92,710 20,116
Gross Unrealized Gains 5,169 474
Gross Unrealized Losses 0 378
Fair Value 97,879 20,212
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 80,326 43,188
Gross Unrealized Gains 8,132 6,123
Gross Unrealized Losses 12 28
Fair Value 88,446 49,283
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 458,065 203,803
Gross Unrealized Gains 37,012 15,969
Gross Unrealized Losses 2,342 4,263
Fair Value 492,735 215,509
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 29,618 0
Gross Unrealized Gains 1,095 0
Gross Unrealized Losses 0 0
Fair Value 30,713 0
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 1,769,142 818,627
Gross Unrealized Gains 109,669 52,866
Gross Unrealized Losses 1,738 7,717
Fair Value 1,877,073 863,776
OTTI in AOCI 0 0
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 918,297 494,640
Gross Unrealized Gains 43,180 30,996
Gross Unrealized Losses 8,368 4,407
Fair Value 953,109 521,229
OTTI in AOCI (677) 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 301,867 132,414
Gross Unrealized Gains 8,685 3,781
Gross Unrealized Losses 31 608
Fair Value 310,521 135,587
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 422,624 219,009
Gross Unrealized Gains 8,523 2,487
Gross Unrealized Losses 9,896 15,842
Fair Value 421,251 205,654
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 322,702 149,196
Gross Unrealized Gains 3,309 2,786
Gross Unrealized Losses 1,243 692
Fair Value 324,768 151,290
OTTI in AOCI (33) (35)
Fixed maturities, available-for-sale | Commercial mortgage-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 470,728 211,429
Gross Unrealized Gains 24,795 4,963
Gross Unrealized Losses 0 652
Fair Value 495,523 215,740
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 221,299 128,971
Gross Unrealized Gains 9,112 4,886
Gross Unrealized Losses 20 19
Fair Value 230,391 133,838
OTTI in AOCI (6) (7)
Equity securities, available-for-sale    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 14 14
Gross Unrealized Gains 4 3
Gross Unrealized Losses 0 0
Fair Value 18 17
Equity securities, available-for-sale | Public utilities    
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
Equity securities, available-for-sale | Mutual funds    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 14 14
Gross Unrealized Gains 4 3
Gross Unrealized Losses 0 0
Fair Value $ 18 $ 17