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Leases Leases (Components of Lease Income) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Operating Lease Income [Line Items]  
Sales-type and Direct Financing Leases, Lease Income $ 5,862
Operating Lease, Lease Income 1,906
Lease Income 7,768
Operating Lease Income from Related Party [Member]  
Operating Lease Income [Line Items]  
Operating Lease, Lease Income $ 19