Financing Receivables - Allowance For Credit Losses Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ (9,175)	$ (10,576)	$ (15,240)
Charge-offs	2,499	5,291	3,880
Recoveries	(96)	(175)	4
Reclassifications	75	0	(16)
Provision	(1,218)	(3,364)	(1,151)
Currency adjustments	(496)	(351)	1,947
Ending balance	(8,411)	(9,175)	(10,576)
Chile
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	(6,209)	(7,240)	(11,063)
Charge-offs	1,910	4,631	3,648
Recoveries	(24)	0	0
Reclassifications	0	0	0
Provision	(1,309)	(3,304)	(1,105)
Currency adjustments	(475)	(296)	1,280
Ending balance	(6,107)	(6,209)	(7,240)
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	(2,966)	(3,336)	(4,177)
Charge-offs	589	660	232
Recoveries	(72)	(175)	4
Reclassifications	75	0	(16)
Provision	91	(60)	(46)
Currency adjustments	(21)	(55)	667
Ending balance	$ (2,304)	$ (2,966)	$ (3,336)