Net Investment In Finance Leases (Gross Finance Lease Receivables By Customer Categories) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	$ 804,880	$ 804,511
Tier 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	725,038	698,014
Tier 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	79,842	106,497
Tier 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables