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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Due in one year or less carrying value $ 113,266us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Due after one year through five years carrying value 193,983us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Due after five years through 10 years carrying value 10,888us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Total HTM fixed income securities carrying value 318,137us-gaap_HeldToMaturitySecurities 392,879us-gaap_HeldToMaturitySecurities
Due in one year or less fair value 114,795us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years fair value 206,188us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through 10 years fair value 12,978us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Total HTM fixed income securities fair value $ 333,961us-gaap_HeldToMaturitySecuritiesFairValue $ 416,981us-gaap_HeldToMaturitySecuritiesFairValue