Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 616,990	$ 553,823
Allowances for current expected credit losses and other reserves	(3,181)	(1,880)
Accounts receivable, net	613,809	551,943
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	176,688	157,619
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 440,302	$ 396,204