Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Computation of Net Income Per Share

The computation of earnings per share is as follows:

	Year ended December 31,
	2017		2016		2015
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	558,929	$	186,678	$	122,641
Shares used in computation:
Weighted-average common shares outstanding	431,885		428,822		425,889
Basic earnings per share	$	1.29	$	0.44	$	0.29
Diluted earnings per share:
Net income	$	558,929	$	186,678	$	122,641
Shares used in computation:
Weighted-average common shares outstanding	431,885		428,822		425,889
Employee stock options	14,929		9,830		10,567
Weighted-average number of shares	446,814		438,652		436,456
Diluted earnings per share	$	1.25	$	0.43	$	0.28

Summary of Potential Common Shares Excluded from Diluted Calculation

The following table summarizes the potential common shares excluded from the diluted calculation:

	Year ended December 31,
	2017	2016	2015
	(in thousands)
Employee stock options	189	1,545	517