Financing Receivables - Summary of Aging of Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	$ 16,625	$ 12,986
Not past due	20,786	9,991
Total financing receivables	37,411	22,977
Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	14,423	10,351
Not past due	19,190	8,494
Total financing receivables	33,613	18,845
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	2,202	2,635
Not past due	1,596	1,497
Total financing receivables	3,798	4,132
Amounts past due less than one year
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	12,099	8,100
Amounts past due less than one year | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	11,302	6,800
Amounts past due less than one year | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	797	1,300
Amounts past due one year or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	4,526	4,886
Amounts past due one year or greater | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	3,121	3,551
Amounts past due one year or greater | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	$ 1,405	$ 1,335