Finance Assets and Lessor Operating Leases (Aging of Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total	$ 1,598,028	$ 1,682,521
1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	1,557,162	1,630,607
Contract value	1,557,162	1,630,607
Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	40,866	51,914
Still accruing interest	9,925	10,869
Not accruing interest	30,941	41,045
Contract value	40,866	51,914
Sales-type lease receivables | North America
Financing Receivable, Past Due [Line Items]
Total	1,081,063	1,110,896
Sales-type lease receivables | North America | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	1,051,352	1,069,288
Contract value	1,051,352	1,069,288
Sales-type lease receivables | North America | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	29,711	41,608
Still accruing interest	6,467	7,917
Not accruing interest	23,244	33,691
Contract value	29,711	41,608
Sales-type lease receivables | International
Financing Receivable, Past Due [Line Items]
Total	197,145	242,036
Sales-type lease receivables | International | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	192,135	238,114
Contract value	192,135	238,114
Sales-type lease receivables | International | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	5,010	3,922
Still accruing interest	1,410	1,111
Not accruing interest	3,600	2,811
Contract value	5,010	3,922
Loan receivables | North America
Financing Receivable, Past Due [Line Items]
Total	289,694	300,319
Loan receivables | North America | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	283,809	294,126
Contract value	283,809	294,126
Loan receivables | North America | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	5,885	6,193
Still accruing interest	1,932	1,769
Not accruing interest	3,953	4,424
Contract value	5,885	6,193
Loan receivables | International
Financing Receivable, Past Due [Line Items]
Total	30,126	29,270
Loan receivables | International | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	29,866	29,079
Contract value	29,866	29,079
Loan receivables | International | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	260	191
Still accruing interest	116	72
Not accruing interest	144	119
Contract value	$ 260	$ 191