Finance Assets (Credit Quality) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 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	$ 1,269,558	$ 1,315,608
Sales-type lease receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	1,000,825	1,023,549
Sales-type lease receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	817,006	819,776
Sales-type lease receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	130,269	148,000
Sales-type lease receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	20,793	21,728
Sales-type lease receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	32,757	34,045
Loan receivables
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	333,218	373,865
Loan receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	301,575	339,373
Loan receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	234,085	262,646
Loan receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	48,947	56,744
Loan receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	5,847	6,791
Loan receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	$ 12,696	$ 13,192