Trade Receivables - Breakdown in Trade Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade accounts receivables	$ 387,524	$ 497,800
(Less) Allowance for credit losses	(23,084)	(16,068)	$ (25,169)	$ (25,918)
Net book value at end of period	$ 364,440	$ 481,732