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Fair Value Measurements (Narratives) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Impairment charges $ 570,000us-gaap_OtherAssetImpairmentCharges $ 0us-gaap_OtherAssetImpairmentCharges $ 2,019,000us-gaap_OtherAssetImpairmentCharges  
Deferred acquisition fees payable        
Fair Value Inputs [Abstract]        
Leverage adjusted unsecured spread 3.55%cpa17_FairValueLeverageAdjustedUnsecuredSpread
/ us-gaap_FairValueByLiabilityClassAxis
= cpa17_DeferredAcquisitionFeesMember
     
Illiquidity Adjustment 0.75%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_FairValueByLiabilityClassAxis
= cpa17_DeferredAcquisitionFeesMember
     
Level 3 | Nonrecurring        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Impairment charges 1,336,000us-gaap_OtherAssetImpairmentCharges
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
3,778,000us-gaap_OtherAssetImpairmentCharges
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
2,019,000us-gaap_OtherAssetImpairmentCharges
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
CMBS        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
CMBS portfolio carrying value       0us-gaap_AssetBackedSecuritiesAtCarryingValue
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
CMBS | Level 3 | Nonrecurring        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Impairment charges 570,000us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
2,019,000us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Equity method investments        
Fair Value Inputs [Abstract]        
Cash flows discount rate 11.75%cpa17_CashFlowsDiscountRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
6.00%cpa17_CashFlowsDiscountRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
   
Fair value inputs, discount rate 10.50%us-gaap_FairValueInputsDiscountRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
6.25%us-gaap_FairValueInputsDiscountRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
   
Fair value inputs, cap rate 9.50%us-gaap_FairValueInputsCapRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
5.75%us-gaap_FairValueInputsCapRate
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
   
Equity method investments | Level 3 | Nonrecurring        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Impairment charges $ 766,000us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 3,778,000us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 0us-gaap_OtherAssetImpairmentCharges
/ cpa17_FairValueByAssetAndLiabilityClassForImpairmentAxis
= us-gaap_EquityMethodInvestmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember