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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Securities
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 504,719,000 $ 550,143,000
Net Unrealized Gains (Losses) 3,052,000 3,926,000
Carrying Value 507,771,000 554,069,000
Unrecognized Holding Gains 35,809,000 40,615,000
Unrecognized Holding Losses (27,000) (23,000)
Fixed maturity securities, held-to-maturity, fair value 543,553,000 594,661,000
Held To Maturity securities average duration 2 years 4 months 24 days  
Number of held to maturity securities transferred to available-for-sale 7  
Securities reclassified from the HTM category to AFS carrying value 15,800,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 900,000  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 192,000 212,000
Carrying Value 5,484,000 5,504,000
Unrecognized Holding Gains 190,000 367,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 5,674,000 5,871,000
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 448,591,000 491,180,000
Net Unrealized Gains (Losses) 5,664,000 6,769,000
Carrying Value 454,255,000 497,949,000
Unrecognized Holding Gains 26,909,000 28,996,000
Unrecognized Holding Losses (27,000) (23,000)
Fixed maturity securities, held-to-maturity, fair value 481,137,000 526,922,000
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 35,986,000 38,285,000
Net Unrealized Gains (Losses) (726,000) (812,000)
Carrying Value 35,260,000 37,473,000
Unrecognized Holding Gains 4,374,000 4,648,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 39,634,000 42,121,000
Asset-backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 6,819,000 6,980,000
Net Unrealized Gains (Losses) (964,000) (1,052,000)
Carrying Value 5,855,000 5,928,000
Unrecognized Holding Gains 1,065,000 1,170,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 6,920,000 7,098,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 8,031,000 8,406,000
Net Unrealized Gains (Losses) (1,114,000) (1,191,000)
Carrying Value 6,917,000 7,215,000
Unrecognized Holding Gains 3,271,000 5,434,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value $ 10,188,000 $ 12,649,000