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Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Our cash and cash equivalents balances comprise the following:


	December 31, 2020			December 31, 2019
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	571,587	62.6	$	549,639	63.0
Money market funds	341,085		37.4	322,455		37.0
Total	$	912,672		$	872,094

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


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

The details of basic and diluted EPS are as follows:


	Year Ended December 31,
(in thousands, except per share data)	2020		2019		2018
Net income	$	433,887	$	451,295	$	419,375
Weighted average shares outstanding – basic	85,840		84,259		83,973
Dilutive effect of stock plans	1,448		1,666		1,940
Weighted average shares outstanding – diluted	87,288		85,925		85,913
Basic earnings per share	$	5.05	$	5.36	$	4.99
Diluted earnings per share	$	4.97	$	5.25	$	4.88
Anti-dilutive shares	23		14		7

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


	Year Ended December 31,
(as a % of revenue)	2020		2019		2018
Revenue from channel partners	22	%	23	%	22	%
Largest channel partner	3	%	4	%	4	%
2nd largest channel partner	2	%	2	%	2	%

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


	As of December 31,
(in thousands)	2020		2019
Cash and cash equivalents held domestically	$	582,882	$	626,433
Cash and cash equivalents held by foreign subsidiaries	329,790		245,661
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	887,886		855,721
Largest balance of cash and cash equivalents held with one financial institution, foreign and domestic	396,430		330,551