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Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Our cash and cash equivalents balances comprise the following:


	December 31, 2021			December 31, 2020
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	580,047	86.9	$	571,587	62.6
Money market funds	87,620		13.1	341,085		37.4
Total	$	667,667		$	912,672

The changes in the allowance for doubtful accounts during the years ended December 31, 2021 and 2020 were as follows:


(in thousands)	2021		2020
Beginning balance – January 1	$	14,000	$	8,700
Additions: Charges to costs and expenses	1,006		6,438
Deductions: Write-offs	(406)		(1,138)
Ending balance – December 31	$	14,600	$	14,000

The details of basic and diluted EPS are as follows:


	Year Ended December 31,
(in thousands, except per share data)	2021		2020		2019
Net income	$	454,627	$	433,887	$	451,295
Weighted average shares outstanding – basic	87,100		85,840		84,259
Dilutive effect of stock plans	1,002		1,448		1,666
Weighted average shares outstanding – diluted	88,102		87,288		85,925
Basic earnings per share	$	5.22	$	5.05	$	5.36
Diluted earnings per share	$	5.16	$	4.97	$	5.25
Anti-dilutive shares	23		23		14

The following table outlines concentrations of risk with respect to our revenue:


	Year Ended December 31,
(as a % of revenue)	2021		2020		2019
Revenue from channel partners	24	%	22	%	23	%

The following table outlines concentrations of risk with respect to our cash and cash equivalents:


	As of December 31,
(in thousands)	2021		2020
Cash and cash equivalents held domestically	$	365,390	$	582,882
Cash and cash equivalents held by foreign subsidiaries	302,277		329,790
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	652,830		887,886
Largest balance of cash and cash equivalents held with one financial institution, foreign and domestic	201,524		396,430