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Statutory Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statutory Information      
Dividend declared and paid $ 97,000us-gaap_PaymentsOfDividends $ 101,000us-gaap_PaymentsOfDividends $ 115,800us-gaap_PaymentsOfDividends
Kansas Department of Commerce      
Statutory Information      
Statutory net income 67,287us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
85,356us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
95,272us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
Statutory capital and surplus 415,720us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
436,457us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
459,009us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
Dividend declared and paid 97,000us-gaap_PaymentsOfDividends
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
101,000us-gaap_PaymentsOfDividends
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
 
Ordinary dividend declared and paid   29,860us-gaap_PaymentsOfDividendsCommonStock
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
 
Extraordinary dividends paid   71,140usic_PaymentsOfExtraordinaryDividends
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
 
Minimum dividend as percentage of insurers' surplus to be considered as extraordinary dividend 10.00%usic_MinimumDividendDistributionAsPercentageOfInsurersSurplusToConsiderDividendExtraordinary
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
TAC of the Company subject to RBC Requirements 449,569usic_TotalAdjustedCapital
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
Corresponding Authorized Control 78,870usic_AuthorizedControlLevel
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
Kansas Department of Commerce | Forecast      
Statutory Information      
Maximum dividend to parent under state regulatory requirements without permission from Kansas regulators $ 35,498us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
Kansas Department of Commerce | Minimum      
Statutory Information      
RBC Ratio under Company Action Level (as a percent) 100.00%usic_RiskBasedCapitalRatioRequirementCompanyActionLevel
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
Kansas Department of Commerce | Maximum      
Statutory Information      
RBC Ratio under Authorized Control Level (as a percent) 100.00%usic_RiskBasedCapitalRatioRequirementAuthorizedControlLevel
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS
   
RBC Ratio under Company Action Level (as a percent) 200.00%usic_RiskBasedCapitalRatioRequirementCompanyActionLevel
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatutoryAccountingPracticesByJurisdictionAxis
= stpr_KS