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Net Investment in Finance Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Concentration Risk [Line Items]    
capital leases, future minimum payments excluding residual values $ 283,374 $ 353,811
Capital Leases, Net Investment in Direct Financing Leases, Executory Costs 0 0
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property 64,560 65,793
Components of the net investment in finance leases    
Allowance on gross finance lease receivables 0 (527)
Gross finance lease receivables 347,934 419,604
Unearned income (2) (52,043) (72,794)
Net investment in finance leases (3) 295,891 346,810
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs $ 0 $ 0
CMA CGM [Member] [Domain]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 46.00% 43.00%
HapagLloyd [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 28.00% 23.00%