Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	$ 10,078,359	$ 9,818,298
Amortized Cost or Cost	14	365
Fair Value	9,687,098	9,362,763
Fair Value	18	18
Available-for-sale Securities \| Fixed maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	10,078,359	9,818,298
Gross Unrealized Gains	158,857	147,795
Gross Unrealized Losses	550,118	603,330
Fair Value	9,687,098	9,362,763
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(699)	(1,470)
Available-for-sale Securities \| Fixed maturities \| 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 or Cost	5,132,074	4,998,652
Gross Unrealized Gains	2,661	2,487
Gross Unrealized Losses	501,335	536,114
Fair Value	4,633,400	4,465,025
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Obligations of U.S. states and their political subdivisions
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	91,978	92,107
Gross Unrealized Gains	625	566
Gross Unrealized Losses	2,768	2,699
Fair Value	89,835	89,974
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Foreign government bonds
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	89,511	64,352
Gross Unrealized Gains	6,193	5,404
Gross Unrealized Losses	162	370
Fair Value	95,542	69,386
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Public utilities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	516,787	448,349
Gross Unrealized Gains	15,225	13,155
Gross Unrealized Losses	7,625	10,348
Fair Value	524,387	451,156
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Redeemable preferred stock
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	29,562	29,581
Gross Unrealized Gains	1,254	288
Gross Unrealized Losses	168	633
Fair Value	30,648	29,236
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| All other U.S. public corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	1,557,141	1,619,814
Gross Unrealized Gains	75,062	73,819
Gross Unrealized Losses	8,684	10,153
Fair Value	1,623,519	1,683,480
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	(771)
Available-for-sale Securities \| Fixed maturities \| All other U.S. private corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	975,332	951,324
Gross Unrealized Gains	29,271	27,234
Gross Unrealized Losses	8,535	13,810
Fair Value	996,068	964,748
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(694)	(694)
Available-for-sale Securities \| Fixed maturities \| All other foreign public corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	160,432	183,253
Gross Unrealized Gains	5,718	5,410
Gross Unrealized Losses	715	1,022
Fair Value	165,435	187,641
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| All other foreign private corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	541,512	501,140
Gross Unrealized Gains	9,149	5,349
Gross Unrealized Losses	12,903	20,450
Fair Value	537,758	486,039
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Asset-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	312,110	248,547
Gross Unrealized Gains	3,689	3,227
Gross Unrealized Losses	204	465
Fair Value	315,595	251,309
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Commercial mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	484,174	484,673
Gross Unrealized Gains	6,347	6,793
Gross Unrealized Losses	6,388	6,753
Fair Value	484,133	484,713
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Available-for-sale Securities \| Fixed maturities \| Residential mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	187,746	196,506
Gross Unrealized Gains	3,663	4,063
Gross Unrealized Losses	631	513
Fair Value	190,778	200,056
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(5)	(5)
Available-for-sale Securities \| Equity securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	14	365
Gross Unrealized Gains	4	4
Gross Unrealized Losses	0	351
Fair Value	18	18
Available-for-sale Securities \| Equity securities \| Industrial, Miscellaneous, and All Others
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	0	351
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	351
Fair Value	0	0
Available-for-sale Securities \| Equity securities \| Mutual funds
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost or Cost	14	14
Gross Unrealized Gains	4	4
Gross Unrealized Losses	0	0
Fair Value	$ 18	$ 18

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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