Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	$ 9,818,298	$ 2,433,626
Fair Value	9,362,763	2,524,272
Amortized Cost	365	14
Fair Value	18	17
Asset-backed securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	251,309
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	248,547
Commercial mortgage-backed securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	484,713
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	484,673
Residential mortgage-backed securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	200,056
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	196,506
Fixed maturities, available-for-sale
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	9,818,298	2,433,626
Gross Unrealized Gains	147,795	125,359
Gross Unrealized Losses	603,330	34,713
Fair Value	9,362,763	2,524,272
OTTI in AOCI	(1,470)	(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	4,998,652	12,233
Gross Unrealized Gains	2,487	28
Gross Unrealized Losses	536,114	107
Fair Value	4,465,025	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	92,107	20,116
Gross Unrealized Gains	566	474
Gross Unrealized Losses	2,699	378
Fair Value	89,974	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	64,352	43,188
Gross Unrealized Gains	5,404	6,123
Gross Unrealized Losses	370	28
Fair Value	69,386	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	448,349	203,803
Gross Unrealized Gains	13,155	15,969
Gross Unrealized Losses	10,348	4,263
Fair Value	451,156	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	29,581	0
Gross Unrealized Gains	288	0
Gross Unrealized Losses	633	0
Fair Value	29,236	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	1,619,814	818,627
Gross Unrealized Gains	73,819	52,866
Gross Unrealized Losses	10,153	7,717
Fair Value	1,683,480	863,776
OTTI in AOCI	(771)	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	951,324	494,640
Gross Unrealized Gains	27,234	30,996
Gross Unrealized Losses	13,810	4,407
Fair Value	964,748	521,229
OTTI in AOCI	(694)	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	183,253	132,414
Gross Unrealized Gains	5,410	3,781
Gross Unrealized Losses	1,022	608
Fair Value	187,641	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	501,140	219,009
Gross Unrealized Gains	5,349	2,487
Gross Unrealized Losses	20,450	15,842
Fair Value	486,039	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		149,196
Gross Unrealized Gains	3,227	2,786
Gross Unrealized Losses	465	692
Fair Value		151,290
OTTI in AOCI	0	(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		211,429
Gross Unrealized Gains	6,793	4,963
Gross Unrealized Losses	6,753	652
Fair Value		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		128,971
Gross Unrealized Gains	4,063	4,886
Gross Unrealized Losses	513	19
Fair Value		133,838
OTTI in AOCI	(5)	(7)
Equity securities, available-for-sale
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	365	14
Gross Unrealized Gains	4	3
Gross Unrealized Losses	351	0
Fair Value	18	17
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
Equity securities, available-for-sale \| Industrial, Miscellaneous, and All Others [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Amortized Cost	351	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	351	0
Fair Value	$ 0	$ 0

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