Finance Assets (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Revenue recognition resume period (less than)	60 days
Allowance for Credit Losses
Balance Beginning	$ 18,633	$ 20,500
Amounts charged to expense	13,093	13,032
Write-offs and other	(11,086)	(15,612)
Balance Closing	$ 20,640	17,920
Sales-type lease receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Revenue recognition discontinuation period (more than)	120 days
Sales-type lease receivables | North America
Allowance for Credit Losses
Balance Beginning	$ 7,721	8,247
Amounts charged to expense	7,037	7,807
Write-offs and other	(3,979)	(8,951)
Balance Closing	10,779	7,103
Sales-type lease receivables | International
Allowance for Credit Losses
Balance Beginning	2,794	2,647
Amounts charged to expense	829	895
Write-offs and other	(1,359)	(774)
Balance Closing	$ 2,264	2,768
Loan receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Revenue recognition discontinuation period (more than)	90 days
Loan receivables | North America
Allowance for Credit Losses
Balance Beginning	$ 7,098	8,517
Amounts charged to expense	4,896	3,892
Write-offs and other	(5,282)	(5,449)
Balance Closing	6,712	6,960
Loan receivables | International
Allowance for Credit Losses
Balance Beginning	1,020	1,089
Amounts charged to expense	331	438
Write-offs and other	(466)	(438)
Balance Closing	$ 885	$ 1,089