Accounts Receivable, Accounts Payable and Accrued Liabilities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts and Financing Receivable, after Allowance for Credit Loss [Abstract]
Receivable from contracts with customers, less estimated credit losses	$ 550,853	$ 519,577
Other receivables	27,739	17,579
Accounts receivable, net	578,592	537,156
Estimated credit losses	21,866	21,494
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable	105,143	106,215
Accrued compensation and related benefits	160,062	135,493
Other accrued liabilities	241,433	278,528
Total Accounts payable and Accrued liabilities	$ 506,638	$ 520,236