Finance Assets (Credit Quality) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 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	$ 1,303,535	$ 1,315,608
Sales-type lease receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	1,012,917	1,023,549
Sales-type lease receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	817,697	819,776
Sales-type lease receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	138,411	148,000
Sales-type lease receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	21,858	21,728
Sales-type lease receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	34,951	34,045
Loan receivables
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	348,228	373,865
Loan receivables | North America
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	314,664	339,373
Loan receivables | North America | Low
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	239,104	262,646
Loan receivables | North America | Medium
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	56,560	56,744
Loan receivables | North America | High
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	6,067	6,791
Loan receivables | North America | Not Scored
Financing Receivable, Recorded Investment [Line Items]
Gross finance receivables	$ 12,933	$ 13,192