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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments    
Delinquency period to place loans on non-accrual status 90 days  
Period after which financial information provided by the equity method investee was used by the entity 3 months  
Other-than-temporary impairment threshold, percentage of market price to original purchase price 80.00%usic_OtherThanTemporaryImpairmentThresholdPercentage  
Other Intangible Assets    
Impairments of finite-lived or indefinite-lived other intangible assets $ 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Long Duration Contracts    
Percentage of risks related to reserves recorded for policies under FFG, LTC and life insurance no longer offered, ceded via reinsurance 100.00%usic_LongDurationInsuranceContractsCededCreditRiskPercentage  
Deferred gain on disposal of businesses    
Adjustments to estimates affecting deferred gain on disposal of businesses $ 12,851usic_AdjustmentsToEstimatesAffectingDeferredGainOnDisposalOfBusinesses $ 0usic_AdjustmentsToEstimatesAffectingDeferredGainOnDisposalOfBusinesses
Buildings | Maximum    
Property and equipment    
Estimated useful lives 39 years 6 months  
Furniture | Maximum    
Property and equipment    
Estimated useful lives 7 years  
Equipment | Maximum    
Property and equipment    
Estimated useful lives 5 years  
Capitalized software costs | Maximum    
Property and equipment    
Estimated useful lives 20 years