Nature of the Business and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in trade and other receivables	$ (175,822)		$ (175,822)		$ (175,043)
Increase to selling, general and administrative expenses	67,418	$ 76,265	219,018	$ 256,018
Revision Of Prior Period, Error Correction, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in trade and other receivables	3,400		$ 3,400
Increase to selling, general and administrative expenses	$ 3,400