Finance Assets and Lessor Operating Leases (Aging of Receivables) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total	$ 1,593,369	$ 1,682,523
1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	1,551,678	1,630,609
Contract value	1,551,678	1,630,609
Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	41,691	51,914
Still accruing interest	7,675	10,869
Not accruing interest	34,016	41,045
Contract value	41,691	51,914
Sales-type lease receivables | North America
Financing Receivable, Past Due [Line Items]
Total	1,064,996	1,110,898
Sales-type lease receivables | North America | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	1,032,400	1,069,290
Contract value	1,032,400	1,069,290
Sales-type lease receivables | North America | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	32,596	41,608
Still accruing interest	4,751	7,917
Not accruing interest	27,845	33,691
Contract value	32,596	41,608
Sales-type lease receivables | International
Financing Receivable, Past Due [Line Items]
Total	215,110	242,036
Sales-type lease receivables | International | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	211,442	238,114
Contract value	211,442	238,114
Sales-type lease receivables | International | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	3,668	3,922
Still accruing interest	1,074	1,111
Not accruing interest	2,594	2,811
Contract value	3,668	3,922
Loan receivables | North America
Financing Receivable, Past Due [Line Items]
Total	285,163	300,319
Loan receivables | North America | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	280,114	294,126
Contract value	280,114	294,126
Loan receivables | North America | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	5,049	6,193
Still accruing interest	1,797	1,769
Not accruing interest	3,252	4,424
Contract value	5,049	6,193
Loan receivables | International
Financing Receivable, Past Due [Line Items]
Total	28,100	29,270
Loan receivables | International | 1 - 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	27,722	29,079
Contract value	27,722	29,079
Loan receivables | International | Greater than 90 days
Financing Receivable, Past Due [Line Items]
Financing receivables	378	191
Still accruing interest	53	72
Not accruing interest	325	119
Contract value	$ 378	$ 191