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Summary of Significant Accounting Policies Deferred Acquisition Costs and Cost of Customer Relationships Acquired (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Policy Acquisition Costs and Cost of Customer Relationship Acquired [Abstract]      
first year commissions, percentage of capitalized deferred acquisition costs 93.00%cia_FirstYearCommissionsPercentageOfCapitalizedDeferredAcquisitionCosts    
New business expense, percentage of capitalized deferred acquisition costs 7.00%cia_NewBusinessExpensePercentageOfCapitalizedDeferredAcquisitionCosts    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of period $ 146,691us-gaap_DeferredPolicyAcquisitionCosts $ 135,569us-gaap_DeferredPolicyAcquisitionCosts $ 124,542us-gaap_DeferredPolicyAcquisitionCosts
Capitalization of deferred policy acquisition costs 32,071us-gaap_DeferredPolicyAcquisitionCostsAdditions 29,398us-gaap_DeferredPolicyAcquisitionCostsAdditions 29,074us-gaap_DeferredPolicyAcquisitionCostsAdditions
Amortization of deferred policy acquisition costs (21,064)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense (18,511)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense (17,845)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit (230)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseEffectOfAdjustmentsToEstimatedGrossProfit 235us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseEffectOfAdjustmentsToEstimatedGrossProfit (202)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseEffectOfAdjustmentsToEstimatedGrossProfit
Balance at end of period $ 157,468us-gaap_DeferredPolicyAcquisitionCosts $ 146,691us-gaap_DeferredPolicyAcquisitionCosts $ 135,569us-gaap_DeferredPolicyAcquisitionCosts
Number of years of available premiums 30 years