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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 380,255 $ 390,622
Net Unrealized Gains (Losses) 1,801 2,257
Carrying Value 382,056 392,879
Unrecognized Holding Gains 21,480 24,102
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value 403,536 416,981
Held To Maturity securities average duration 2 years 2 months  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292 5,292
Net Unrealized Gains (Losses) 110 131
Carrying Value 5,402 5,423
Unrecognized Holding Gains 150 168
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value 5,552 5,591
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 344,360 348,109
Net Unrealized Gains (Losses) 3,475 4,013
Carrying Value 347,835 352,122
Unrecognized Holding Gains 16,472 17,634
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value 364,307 369,756
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 21,903 28,174
Net Unrealized Gains (Losses) (341) (346)
Carrying Value 21,562 27,828
Unrecognized Holding Gains 2,902 2,446
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value 24,464 30,274
Asset-backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,347 3,413
Net Unrealized Gains (Losses) (621) (655)
Carrying Value 2,726 2,758
Unrecognized Holding Gains 640 657
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value 3,366 3,415
Commercial Mortgage-backed Securities (CMBS) [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,353 5,634
Net Unrealized Gains (Losses) (822) (886)
Carrying Value 4,531 4,748
Unrecognized Holding Gains 1,316 3,197
Unrecoginzed Holding Losses 0 0
Fixed income securities, held-to-maturity, fair value $ 5,847 $ 7,945