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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost $ 2,521,513 $ 2,433,626
Amortized Cost 14 14
Fair Value 2,653,708 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 (800) 100
Fixed maturities, available-for-sale    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 2,521,513 2,433,626
Gross Unrealized Gains 158,599 125,359
Gross Unrealized Losses 26,404 34,713
Fair Value 2,653,708 2,524,272
OTTI in AOCI (669) (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 18,175 12,233
Gross Unrealized Gains 231 28
Gross Unrealized Losses 0 107
Fair Value 18,406 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 23,567 20,116
Gross Unrealized Gains 1,020 474
Gross Unrealized Losses 0 378
Fair Value 24,587 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 42,886 43,188
Gross Unrealized Gains 6,771 6,123
Gross Unrealized Losses 10 28
Fair Value 49,647 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 202,972 203,803
Gross Unrealized Gains 21,631 15,969
Gross Unrealized Losses 2,092 4,263
Fair Value 222,511 215,509
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 16,000  
Gross Unrealized Gains 720  
Gross Unrealized Losses 0  
Fair Value 16,720  
OTTI in AOCI 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 797,603 818,627
Gross Unrealized Gains 65,416 52,866
Gross Unrealized Losses 5,010 7,717
Fair Value 858,009 863,776
OTTI in AOCI 31 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 505,153 494,640
Gross Unrealized Gains 32,605 30,996
Gross Unrealized Losses 5,230 4,407
Fair Value 532,528 521,229
OTTI in AOCI (660) 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 125,408 132,414
Gross Unrealized Gains 4,323 3,781
Gross Unrealized Losses 34 608
Fair Value 129,697 135,587
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 232,411 219,009
Gross Unrealized Gains 3,515 2,487
Gross Unrealized Losses 12,377 15,842
Fair Value 223,549 205,654
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 162,166 149,196
Gross Unrealized Gains 2,000 2,786
Gross Unrealized Losses 1,638 692
Fair Value 162,528 151,290
OTTI in AOCI (34) (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 270,865 211,429
Gross Unrealized Gains 14,242 4,963
Gross Unrealized Losses 4 652
Fair Value 285,103 215,740
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 124,307 128,971
Gross Unrealized Gains 6,125 4,886
Gross Unrealized Losses 9 19
Fair Value 130,423 133,838
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