Finance Assets (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 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	13,749	8,989
Write-offs and other	(11,038)	(9,877)
Balance Closing	$ 21,344	19,612
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	5,946	5,182
Write-offs and other	(2,538)	(4,973)
Balance Closing	11,129	8,456
Sales-type lease receivables | International
Allowance for Credit Losses
Balance Beginning	2,794	2,647
Amounts charged to expense	545	466
Write-offs and other	(933)	(617)
Balance Closing	$ 2,406	2,496
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	7,008	2,891
Write-offs and other	(7,237)	(3,905)
Balance Closing	6,869	7,503
Loan receivables | International
Allowance for Credit Losses
Balance Beginning	1,020	1,089
Amounts charged to expense	250	450
Write-offs and other	(330)	(382)
Balance Closing	$ 940	$ 1,157