Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

The Company's cash and cash equivalents balances comprise the following:



	December 31, 2016			December 31, 2015
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	488,504	59.4	$	427,244	54.5
Money market funds	333,975		40.6	356,924		45.5
Total	$	822,479		$	784,168

The details of basic and diluted EPS are as follows:



	Year Ended December 31,
(in thousands, except per share data)	2016		2015		2014
Net income	$	265,636	$	252,521	$	254,690
Weighted average shares outstanding – basic	87,227		89,561		92,067
Dilutive effect of stock plans	1,742		1,941		2,127
Weighted average shares outstanding – diluted	88,969		91,502		94,194
Basic earnings per share	$	3.05	$	2.82	$	2.77
Diluted earnings per share	$	2.99	$	2.76	$	2.70
Anti-dilutive options	260		206		718

The following table outlines concentrations of risk with respect to the Company's revenue:



	Year Ended December 31,
(as a % of revenue)	2016		2015		2014
Revenue from channel partners	24	%	24	%	25	%
Largest channel partner	5	%	5	%	4	%
2^nd largest channel partner	2	%	2	%	2	%

The following table outlines concentrations of risk with respect to the Company's cash and cash equivalents:



	As of December 31,
(in thousands)	2016		2015
Cash and cash equivalents held domestically	$	593,348	$	539,031
Cash and cash equivalents held by foreign subsidiaries	229,131		245,137
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	805,374		763,400
Largest balance of cash and cash equivalents held with one financial institution, foreign and domestic	377,602		440,650