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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) - Major Types of Debt Securities [Domain] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less carrying value $ 87,104  
Due after one year through five years carrying value 149,865  
Due after five years through 10 years carrying value 10,890  
Carrying Value 247,859 $ 318,137
Due in one year or less fair value 88,688  
Due after one year through five years fair value 158,092  
Due after five years through 10 years fair value 12,922  
HTM, Fair Value $ 259,702 $ 333,961