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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost $ 2,436,767 $ 2,609,253
Amortized Cost 14 14
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 2,566,261 2,800,593
Equity securities, available-for-sale 17 17
Net unrealized gains 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 2,436,767 2,609,253
Gross Unrealized Gains 152,376 198,461
Gross Unrealized Losses 22,882 7,121
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 2,566,261 2,800,593
Other-than-temporary Impairments in AOCI (43) (85)
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 6,307 6,324
Gross Unrealized Gains 88 22
Gross Unrealized Losses 0 10
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 6,395 6,336
Other-than-temporary Impairments 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 20,470 69,486
Gross Unrealized Gains 603 1,323
Gross Unrealized Losses 582 20
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 20,491 70,789
Other-than-temporary Impairments 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 43,379 29,738
Gross Unrealized Gains 6,837 7,621
Gross Unrealized Losses 7 4
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 50,209 37,355
Other-than-temporary Impairments 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 195,690 198,277
Gross Unrealized Gains 19,670 19,909
Gross Unrealized Losses 2,742 1,593
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 212,618 216,593
Other-than-temporary Impairments in AOCI 0 0
Fixed maturities, available-for-sale | All other corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 1,655,728 1,743,110
Gross Unrealized Gains 106,648 146,872
Gross Unrealized Losses 19,242 4,891
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 1,743,134 1,885,091
Other-than-temporary Impairments 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 145,579 144,324
Gross Unrealized Gains 3,377 5,078
Gross Unrealized Losses 253 391
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 148,703 149,011
Other-than-temporary Impairments in AOCI (36) (39)
Fixed maturities, available-for-sale | Commercial mortgage-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 234,554 291,868
Gross Unrealized Gains 8,870 10,523
Gross Unrealized Losses 56 206
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 243,368 302,185
Other-than-temporary Impairments in AOCI 0 (10)
Fixed maturities, available-for-sale | Residential mortgage-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 135,060 126,126
Gross Unrealized Gains 6,283 7,113
Gross Unrealized Losses 0 6
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,436,767; 2014: $2,609,253) 141,343 133,233
Other-than-temporary Impairments in AOCI (7) (36)
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 3 3
Gross Unrealized Losses 0 0
Equity securities, available-for-sale 17 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
Equity securities, available-for-sale 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 3 3
Gross Unrealized Losses 0 0
Equity securities, available-for-sale $ 17 $ 17