Finance Receivables (Contractual Maturities Of Finance Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
2019	$ 2,254,873
2020	1,259,632
2021	1,343,589
2022	1,477,250
2023	1,067,325
Thereafter	9,147
Total finance receivables	7,411,816	$ 7,157,557	$ 7,008,801	$ 7,015,331	$ 6,560,245
United States
Accounts, Notes, Loans and Financing Receivable [Line Items]
2019	2,132,189
2020	1,209,886
2021	1,289,673
2022	1,418,813
2023	1,051,626
Thereafter	9,147
Total finance receivables	7,111,334
Canada
Accounts, Notes, Loans and Financing Receivable [Line Items]
2019	122,684
2020	49,746
2021	53,916
2022	58,437
2023	15,699
Thereafter	0
Total finance receivables	$ 300,482