Finance Assets and Lessor Operating Leases (Aging of Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 1,606,382	$ 1,688,259
1 - 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	1,561,894	1,636,345
Contract value	1,561,894	1,636,345
Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	44,488	51,914
Still accruing interest	9,730	10,869
Not accruing interest	34,758	41,045
Contract value	44,488	51,914
Sales-type lease receivables | North America
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,099,620	1,110,896
Sales-type lease receivables | North America | 1 - 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	1,065,521	1,069,288
Contract value	1,065,521	1,069,288
Sales-type lease receivables | North America | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	34,099	41,608
Still accruing interest	6,709	7,917
Not accruing interest	27,390	33,691
Contract value	34,099	41,608
Sales-type lease receivables | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	190,468	247,774
Sales-type lease receivables | International | 1 - 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	186,947	243,852
Contract value	186,947	243,852
Sales-type lease receivables | International | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	3,521	3,922
Still accruing interest	715	1,111
Not accruing interest	2,806	2,811
Contract value	3,521	3,922
Loan receivables | North America
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	286,716	300,319
Loan receivables | North America | 1 - 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	280,124	294,126
Contract value	280,124	294,126
Loan receivables | North America | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	6,592	6,193
Still accruing interest	2,178	1,769
Not accruing interest	4,414	4,424
Contract value	6,592	6,193
Loan receivables | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	29,578	29,270
Loan receivables | International | 1 - 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	29,302	29,079
Contract value	29,302	29,079
Loan receivables | International | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivables	276	191
Still accruing interest	128	72
Not accruing interest	148	119
Contract value	$ 276	$ 191