Finance Assets (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Credit Losses
Balance at	$ 18,633	$ 20,500	$ 21,690
Amounts charged to expense	16,600	15,607	13,371
Accounts written off	(15,011)	(17,474)	(14,561)
Balance at	20,222	18,633	20,500
Sales-type lease receivables | North America
Allowance for Credit Losses
Balance at	7,721	8,247	6,606
Amounts charged to expense	7,928	7,544	5,136
Accounts written off	(5,396)	(8,070)	(3,495)
Balance at	10,253	7,721	8,247
Sales-type lease receivables | International
Allowance for Credit Losses
Balance at	2,794	2,647	3,542
Amounts charged to expense	1,315	1,280	1,161
Accounts written off	(1,754)	(1,133)	(2,056)
Balance at	2,355	2,794	2,647
Loan receivables | North America
Allowance for Credit Losses
Balance at	7,098	8,517	10,024
Amounts charged to expense	6,825	6,273	6,238
Accounts written off	(7,146)	(7,692)	(7,745)
Balance at	6,777	7,098	8,517
Loan receivables | International
Allowance for Credit Losses
Balance at	1,020	1,089	1,518
Amounts charged to expense	532	510	836
Accounts written off	(715)	(579)	(1,265)
Balance at	$ 837	$ 1,020	$ 1,089