Finance Receivables (Contractual Maturities Of Finance Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017	$ 2,112,112
2018	1,168,159
2019	1,305,778
2020	1,270,965
2021	1,130,033
Thereafter	21,754
Total finance receivables	7,008,801	$ 7,015,331	$ 6,560,245	$ 6,110,256	$ 5,889,519
United States
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017	2,004,454
2018	1,123,428
2019	1,256,972
2020	1,217,711
2021	1,106,241
Thereafter	21,754
Total finance receivables	6,730,560
Canada
Accounts, Notes, Loans and Financing Receivable [Line Items]
2017	107,658
2018	44,731
2019	48,806
2020	53,254
2021	23,792
Thereafter	0
Total finance receivables	$ 278,241