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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Amortized Cost $ 201,054 $ 317,179
Net Unrealized Gains (Losses) 300 958
Total HTM fixed income securities carrying value 201,354 318,137
Unrecognized Holding Gains 8,190 15,824
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value $ 209,544 333,961
Held To Maturity Securities Average Duration 1 year 6 months  
Foreign Government [Member]    
Amortized Cost   5,292
Net Unrealized Gains (Losses)   47
Total HTM fixed income securities carrying value   5,339
Unrecognized Holding Gains   55
Unrecognized Holding Losses   0
Total HTM fixed income securities fair value   5,394
Obligations of States and Political Subdivisions [Member]    
Amortized Cost $ 175,269 285,301
Net Unrealized Gains (Losses) 848 2,071
Total HTM fixed income securities carrying value 176,117 287,372
Unrecognized Holding Gains 5,763 11,760
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value 181,880 299,132
Corporate Securities [Member]    
Amortized Cost 20,228 18,899
Net Unrealized Gains (Losses) (185) (273)
Total HTM fixed income securities carrying value 20,043 18,626
Unrecognized Holding Gains 1,972 2,796
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value 22,015 21,422
Asset-backed Securities [Member]    
Amortized Cost 1,030 2,818
Net Unrealized Gains (Losses) (120) (455)
Total HTM fixed income securities carrying value 910 2,363
Unrecognized Holding Gains 118 460
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value 1,028 2,823
Commercial Mortgage Backed Securities [Member]    
Amortized Cost 4,527 4,869
Net Unrealized Gains (Losses) (243) (432)
Total HTM fixed income securities carrying value 4,284 4,437
Unrecognized Holding Gains 337 753
Unrecognized Holding Losses 0 0
Total HTM fixed income securities fair value $ 4,621 $ 5,190