15. Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The calculation of basic and diluted net income per share for the three and nine months ended September 30, 2018 and 2017 was as follows (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Basic net income per share
Numerator:
Net income	$	57,750	$	205,747	$	92,210	$	266,839
Denominator:
Weighted-average common shares outstanding	104,804		104,432		104,711		104,287
Diluted net income per share
Denominator:
Weighted-average common shares outstanding	104,804		104,432		104,711		104,287
Effect of restricted and performance stock units and stock purchase plan shares	1,359		1,228		1,500		602
Weighted-average shares used in computing diluted net income per share	106,163		105,660		106,211		104,889
Net income per share:
Basic	$	0.55	$	1.97	$	0.88	$	2.56
Diluted	$	0.54	$	1.95	$	0.87	$	2.54

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the potential shares of common stock that were excluded from the computation of diluted net income per share for the three and nine months ended September 30, 2018 and 2017 as such shares would have had an anti-dilutive effect (in thousands):

	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Anti-dilutive shares	603	2	394	195