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Financing Receivables - Summary of Aging of Financing Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due (on non-accrual status) $ 14,677 $ 12,986
Not past due 23,479 9,991
Total financing receivables 38,156 22,977
Chile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due (on non-accrual status) 13,330 10,351
Not past due 21,028 8,494
Total financing receivables 34,358 18,845
Other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due (on non-accrual status) 1,347 2,635
Not past due 2,451 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 11,062 8,100
Amounts past due less than one year | Chile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Amount past due 10,257 6,800
Amounts past due less than one year | Other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Amount past due 805 1,300
Amounts past due one year or greater    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Amount past due 3,615 4,886
Amounts past due one year or greater | Chile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Amount past due 3,073 3,551
Amounts past due one year or greater | Other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Amount past due $ 542 $ 1,335