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Prepaid Land Lease Payments - Schedule of Prepaid Land Lease Payments (Details) - Use Rights [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Prepaid land lease payments $ 10,502 $ 11,098
Less: accumulated amortization 2,198 2,070
Net carrying value $ 8,304 $ 9,028