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Nature of Operations and Summary of Significant Accounting Policies Direct Financing Leases (Details)
12 Months Ended
Dec. 31, 2013
Minimum
 
Unguaranteed Residual Percentage Of Cost [Line Items]  
Unguaranteed residual percent of cost 3.00%
Maximum
 
Unguaranteed Residual Percentage Of Cost [Line Items]  
Unguaranteed residual percent of cost 20.00%