Net Investment In Sales-Type And Direct Finance Leases (Gross Finance Lease Receivables By Customer Categories) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	$ 771,868	$ 804,511
Tier 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	704,465	698,014
Tier 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables	67,403	106,497
Tier 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross sales-type and finance lease receivables