Debt - Lines Of Credit (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Credit line capacity	$ 197,411,000
Balance Outstanding	$ 110,943,000	$ 114,664,000
JPMorgan Chase
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	3.27%
Credit line capacity	$ 175,000,000
Balance Outstanding	$ 105,091,000	104,152,000
Itau Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 1,810,000
Balance Outstanding	$ 275,000	446,000
Bank of Chile
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	6.60%
Credit line capacity	$ 3,800,000
Balance Outstanding	$ 1,090,000	1,598,000
BICE Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 2,500,000
Balance Outstanding	$ 863,000	1,819,000
BBVA Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 3,250,000
Balance Outstanding	$ 500,000	1,665,000
Security Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 573,000
Balance Outstanding	$ 573,000	501,000
Estado Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 3,500,000
Balance Outstanding	$ 930,000	2,111,000
Santander Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.50%
Credit line capacity	$ 4,500,000
Balance Outstanding	$ 1,243,000	1,988,000
Scotiabank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.00%
Credit line capacity	$ 1,800,000
Balance Outstanding	$ 378,000	384,000
Corpbanca
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	5.00%
Credit line capacity	$ 0
Balance Outstanding	$ 0	0
Banco Bilbao Vizcaya
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	2.90%
Credit line capacity	$ 308,000
Balance Outstanding	$ 0	0
Santander Bank
Line of Credit Facility [Line Items]
Interest rate on borrowings at March 31, 2018	2.67%
Credit line capacity	$ 370,000
Balance Outstanding	$ 0	$ 0