Financing Receivables - Allowance For Credit Losses Rollforward (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ (6,472)	$ (7,086)
Charge-offs	1,375	3,128
Recoveries	0	0
Reclassifications	0	0
Provision	(1,215)	(1,864)
Currency adjustments	436	(407)
Ending balance	(5,876)	(6,229)
Chile
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	(6,107)	(6,209)
Charge-offs	1,338	2,798
Recoveries	0	0
Reclassifications	0	0
Provision	(1,233)	(2,089)
Currency adjustments	434	(360)
Ending balance	(5,568)	(5,860)
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	(365)	(877)
Charge-offs	37	330
Recoveries	0	0
Reclassifications	0	0
Provision	18	225
Currency adjustments	2	(47)
Ending balance	$ (308)	$ (369)