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Net Investment In Direct Finance Leases (Gross Finance Lease Receivables By Customer Categories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Gross finance lease receivables [1] $ 140,172 $ 123,563
Tier 1 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross finance lease receivables 86,793 74,777
Tier 2 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross finance lease receivables 53,379 48,786
Tier 3 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross finance lease receivables
[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 receivables are reduced as customer payments are received. There was $4.0 million and $2.1 million unguaranteed residual value at June 30, 2017 and December 31, 2016, respectively, included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of June 30, 2017 and December 31, 2016.