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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Securities
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 419,932,000 $ 550,143,000
Net Unrealized Gains (Losses) 2,030,000 3,926,000
Carrying Value 421,962,000 554,069,000
Unrecognized Holding Gains 26,567,000 40,615,000
Unrecognized Holding Losses 0 (23,000)
Fixed maturity securities, held-to-maturity, fair value 448,529,000 594,661,000
Held To Maturity securities average duration 2 years 3 months 18 days  
Number of held to maturity securities transferred to available-for-sale 16  
Securities reclassified from the HTM category to AFS carrying value 39,600,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 1,400,000  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 151,000 212,000
Carrying Value 5,443,000 5,504,000
Unrecognized Holding Gains 122,000 367,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 5,565,000 5,871,000
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 372,281,000 491,180,000
Net Unrealized Gains (Losses) 4,065,000 6,769,000
Carrying Value 376,346,000 497,949,000
Unrecognized Holding Gains 19,297,000 28,996,000
Unrecognized Holding Losses 0 (23,000)
Fixed maturity securities, held-to-maturity, fair value 395,643,000 526,922,000
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 29,228,000 38,285,000
Net Unrealized Gains (Losses) (466,000) (812,000)
Carrying Value 28,762,000 37,473,000
Unrecognized Holding Gains 3,015,000 4,648,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 31,777,000 42,121,000
Asset-backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,890,000 6,980,000
Net Unrealized Gains (Losses) (755,000) (1,052,000)
Carrying Value 5,135,000 5,928,000
Unrecognized Holding Gains 776,000 1,170,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value 5,911,000 7,098,000
Commercial Mortgage-backed Securities (CMBS) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,241,000 8,406,000
Net Unrealized Gains (Losses) (965,000) (1,191,000)
Carrying Value 6,276,000 7,215,000
Unrecognized Holding Gains 3,357,000 5,434,000
Unrecognized Holding Losses 0 0
Fixed maturity securities, held-to-maturity, fair value $ 9,633,000 $ 12,649,000