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Direct Financing Lease Receivables (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]        
Provision for Loan, Lease, and Other Losses $ 2 $ 667    
Financing Receivable, Allowance for Credit Losses, Write-downs (141) (919)    
Net Investment in Direct Financing and Sales Type Leases [Abstract]        
Total minimum lease payments receivable 633,801   629,919  
Less: Executory costs (197,549)   (201,777)  
Minimum lease payments receivable 436,252   428,142  
Less: Allowance for uncollectibles (564) (651) (703) (903)
Net minimum lease payments receivable 435,688   427,439  
Unguaranteed residuals 57,545   60,764  
Less: Unearned income (93,597)   (96,280)  
Net investment in direct financing and sales-type leases 399,636   391,923  
Current portion (77,618)   (76,395)  
Non-current portion $ 322,018   $ 315,528