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Summary of Significant Accounting Policies Cost of Customer Relationships Acquired (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Number of Years-Cost of Customer Relationship Acquired Amortization 5 years      
Number of years of available premiums 30 years      
2014 $ 1,930us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpenseNextTwelveMonths      
2015 1,730us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpenseYearTwo      
2016 1,589us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpenseYearThree      
2017 1,464us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpenseYearFour      
2018 1,351us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpenseYearFive      
Thereafter 16,290cia_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizedExpenseAfterFiveYears      
Net 24,354cia_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpense      
Effects of unrealized (gains) losses on CCRA (812)us-gaap_EffectsOfUnrealizedHoldingGainLossOnPresentValueOfFutureInsuranceProfits1      
Total 23,542us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination 23,374us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination 25,116us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination 27,945us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombination
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Additions 2,762us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAdditions 0us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAdditions 0us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAdditions  
Intangibles Assets Arising from Insurance Contracts Acquired in Business Combination, Amortization Expense (2,182)us-gaap_IntangiblesAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpense (2,408)us-gaap_IntangiblesAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpense (2,467)us-gaap_IntangiblesAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationAmortizationExpense  
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Period Increase (Decrease) $ (412)us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationPeriodIncreaseDecrease $ 666us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationPeriodIncreaseDecrease $ (362)us-gaap_IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationPeriodIncreaseDecrease  
Customer Relationships [Member] | Minimum [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Discount Rate 3.70%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Customer Relationships [Member] | Maximum [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Discount Rate 8.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember