Accounts Receivable, Accounts Payable and Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Accounts Receivable Accounts Payable And Accrued Liabilities [Abstract]

Schedule of Accounts Receivable

Accounts receivable consist of the following:

	As of December 31
(in thousands)	2021		2020
Receivables from contracts with customers, less estimated credit losses of $21,836 and $21,494	$	589,582	$	519,577
Other receivables	17,889		17,579
	$	607,471	$	537,156

Schedule of Changes in Estimated Credit Losses

The changes in estimated credit losses was as follows:

(in thousands)	Balance at Beginning of Period		Additions – Charged to Costs and Expenses		Deductions		Balance at End of Period
2021	$	21,494	$	6,824	$	(6,482)	$	21,836
2020	14,276		10,667		(3,449)		21,494
2019	14,775		1,706		(2,205)		14,276

Schedule of Accounts Payable and Accrued Liabilities

Accounts payable and accrued liabilities consist of the following:

	As of December 31
(in thousands)	2021		2020
Accounts payable	$	126,985	$	106,215
Accrued compensation and related benefits	179,307		135,493
Other accrued liabilities	277,337		278,528
	$	583,629	$	520,236