Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Summary Of Cash And Cash Equivalents

Our cash and cash equivalents balances comprise the following:

	December 31, 2019			December 31, 2018
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	549,639	63.0	$	331,084	42.6
Money market funds	322,455		37.0	446,055		57.4
Total	$	872,094		$	777,139

Basic And Diluted Earnings Per Share

The details of basic and diluted EPS are as follows:

	Year Ended December 31,
(in thousands, except per share data)	2019		2018		2017
Net income	$	451,295	$	419,375	$	259,251
Weighted average shares outstanding – basic	84,259		83,973		84,988
Dilutive effect of stock plans	1,666		1,940		1,866
Weighted average shares outstanding – diluted	85,925		85,913		86,854
Basic earnings per share	$	5.36	$	4.99	$	3.05
Diluted earnings per share	$	5.25	$	4.88	$	2.98
Anti-dilutive shares	14		7		84

Customer Concentration Risk

Schedule Of Risk Concentration

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

	Year Ended December 31,
(as a % of revenue)	2019		2018		2017
Revenue from channel partners	23	%	22	%	25	%
Largest channel partner	4	%	4	%	5	%
2nd largest channel partner	2	%	2	%	2	%

Credit Concentration Risk

Schedule Of Risk Concentration

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

	As of December 31,
(in thousands)	2019		2018
Cash and cash equivalents held domestically	$	626,433	$	616,249
Cash and cash equivalents held by foreign subsidiaries	245,661		160,890
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	855,721		754,163
Largest balance of cash and cash equivalents held with one financial institution, foreign and domestic	330,551		452,166