SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

For the Three Years Ended December 31, 2020

(in thousands)

Allowance for Doubtful Accounts	Balance Beginning of Period		Additions Charged to Operating Expense		Deductions from Reserves (1)		Balance End of Period
2018	$	16,173	$	15,817	$	5,622	$	26,368
2019	26,368		2,408		6,283		22,493
2020	22,493		10,133		7,992		24,634

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(1) Amounts deemed uncollectible, net of recoveries.

Revenue Allowance(2)	Balance Beginning of Period		Additions Charged to Revenue		Deductions from Reserves		Balance End of Period
2018	$	11,626	$	41,338	$	35,017	$	17,947
2019	17,947		35,549		37,278		16,218
2020	16,218		45,784		41,887		20,115

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(2) Due to the nature of the Company's businesses and the invoices that result from the services provided, customers may withhold payments and attempt to renegotiate amounts invoiced. In addition, for some of the services provided, the Company's invoices are based on quotes that can either generate credits or debits when the actual revenue amount is known. Based on industry knowledge and historical trends, the Company records a revenue allowance accordingly. This practice causes the volume of activity flowing through the revenue allowance during the year to be higher than the balance at the end of the year. Increases in overall sales volumes and the expansion of the customer base in recent years have also increased the volume of additions and deductions to the allowance during the year. The revenue allowance is intended to cover the net amount of revenue adjustments that may need to be credited to customers' accounts in future periods. Management determines the appropriate total revenue allowance by evaluating the following factors on a customer-by-customer basis as well as on a consolidated level: trends in adjustments to previously billed amounts, existing economic conditions and other information as deemed applicable. Revenue allowance estimates can differ materially from the actual adjustments, but historically the revenue allowance has been sufficient to cover the net amount of the reserve adjustments issued in subsequent reporting periods.

Valuation Allowance on Deferred Tax Assets	Balance Beginning of Period		Additions Charged to Income Tax Expense		Other Changes to Reserves		Balance End of Period
2018	$	68,355	$	10,466	$	474	$	79,295
2019	79,295		4,459		(111)		83,643
2020	83,643		(11,339)		4,740		77,044