Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Foreign currency (Details)

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Summary of Significant Accounting Policies - Foreign currency (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other (expense) income, net      
Foreign exchange (losses) gains $ (15,257,000) $ 8,744,000 $ 1,002,000