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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Securities
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 476,894,000 $ 550,143,000
Net Unrealized Gains (Losses) 2,613,000 3,926,000
Carrying Value 479,507,000 554,069,000
Unrecognized Holding Gains 28,152,000 40,615,000
Unrecognized Holding Losses (34,000) (23,000)
Fixed maturity securities, held-to-maturity, fair value 507,625,000 594,661,000
Held To Maturity securities average duration 2 years 3 months 18 days  
Number of held to maturity securities transferred to available-for-sale 10  
Securities reclassified from the HTM category to AFS carrying value 22,900,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 1,100,000  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 172,000 212,000
Carrying Value 5,464,000 5,504,000
Unrecognized Holding Gains 194,000 367,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 5,658,000 5,871,000
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 421,460,000 491,180,000
Net Unrealized Gains (Losses) 4,947,000 6,769,000
Carrying Value 426,407,000 497,949,000
Unrecognized Holding Gains 20,520,000 28,996,000
Unrecognized Holding Losses (34,000) (23,000)
Fixed maturity securities, held-to-maturity, fair value 446,893,000 526,922,000
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 35,983,000 38,285,000
Net Unrealized Gains (Losses) (643,000) (812,000)
Carrying Value 35,340,000 37,473,000
Unrecognized Holding Gains 3,541,000 4,648,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 38,881,000 42,121,000
Asset-backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 6,536,000 6,980,000
Net Unrealized Gains (Losses) (824,000) (1,052,000)
Carrying Value 5,712,000 5,928,000
Unrecognized Holding Gains 868,000 1,170,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 6,580,000 7,098,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,623,000 8,406,000
Net Unrealized Gains (Losses) (1,039,000) (1,191,000)
Carrying Value 6,584,000 7,215,000
Unrecognized Holding Gains 3,029,000 5,434,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value $ 9,613,000 $ 12,649,000