Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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



	December 31, 2015			December 31, 2014
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	427,244	54.5	$	506,731	64.3
Money market mutual funds	356,924		45.5	281,333		35.7
Total	$	784,168		$	788,064

The details of basic and diluted EPS are as follows:



	Year Ended December 31,
(in thousands, except per share data)	2015		2014		2013
Net income	$	252,521	$	254,690	$	245,327
Weighted average shares outstanding – basic	89,561		92,067		92,691
Dilutive effect of stock plans	1,941		2,127		2,448
Weighted average shares outstanding – diluted	91,502		94,194		95,139
Basic earnings per share	$	2.82	$	2.77	$	2.65
Diluted earnings per share	$	2.76	$	2.70	$	2.58
Anti-dilutive options	206		718		885

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



	Year Ended December 31,
(as a % of revenue)	2015		2014		2013
Revenue from channel partners	24	%	25	%	25	%
Largest channel partner	5	%	4	%	6	%
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)	2015		2014
Cash and cash equivalents held domestically	$	539,031	$	556,328
Cash and cash equivalents held by foreign subsidiaries	245,137		231,736
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	763,400		747,911
Largest balance of cash and cash equivalents held with one financial institution, foreign and domestic	440,650		350,628