Variable Interest Entities (Information Related To The Assets And Liabilities Of The VIEs) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Restricted cash	$ 46,012	$ 46,106
Securitized notes receivable, net	431,801	430,480
Receivable backed notes payable - non-recourse	336,421	327,358
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Restricted cash	19,488	21,894
Securitized notes receivable, net	282,599	287,012
Receivable backed notes payable - non-recourse	$ 336,421	$ 327,358