Finance Assets (Credit Quality) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Low
Financing Receivable, Recorded Investment [Line Items]
Approximate percentage of portfolio	30.00%
Medium
Financing Receivable, Recorded Investment [Line Items]
Approximate percentage of portfolio	40.00%
High
Financing Receivable, Recorded Investment [Line Items]
Approximate percentage of portfolio	30.00%
Sales-type lease receivables
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	$ 1,277,359	$ 1,315,608
Sales-type lease receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	1,004,241	1,023,549
Sales-type lease receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	817,554	819,776
Sales-type lease receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	130,175	148,000
Sales-type lease receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	20,663	21,728
Sales-type lease receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	35,849	34,045
Loan receivables
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	345,990	373,865
Loan receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	313,049	339,373
Loan receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	244,570	262,646
Loan receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	50,711	56,744
Loan receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	5,593	6,791
Loan receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	$ 12,175	$ 13,192