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Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid assets $ 27,992 $ 29,840
Refundable income taxes 9,034 10,524
Fair value of derivative instruments (Note 26) 1,372 8,234
Other 164 76
Total other current assets $ 38,562 $ 48,674