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Net Investment In Direct Finance Leases (Gross Finance Lease Receivables By Categories Of Customers) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Gross Finance Lease Receivables [Line Items]    
Gross finance lease receivables $ 116,992us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived [1] $ 103,887us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived [1]
Tier 1 [Member]    
Gross Finance Lease Receivables [Line Items]    
Gross finance lease receivables 89,960us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
/ cap_CategoriesOfCustomersAxis
= cap_Tier1Member		 85,990us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
/ cap_CategoriesOfCustomersAxis
= cap_Tier1Member
Tier 2 [Member]    
Gross Finance Lease Receivables [Line Items]    
Gross finance lease receivables $ 27,032us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
/ cap_CategoriesOfCustomersAxis
= cap_Tier2Member		 $ 17,897us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesMinimumPaymentsToBeReceived
/ cap_CategoriesOfCustomersAxis
= cap_Tier2Member
[1] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivable is reduced as customer payments are received.  There was no unguaranteed residual value at December 31, 2014 and approximately $0.1 at December 31, 2013 included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of December 31, 2014 and 2013.