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Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share:

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Numerator:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Net income

 

$

93,277

 

 

$

75,994

 

 

$

321,260

 

 

$

261,494

 

Denominator:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shares used in net income per common share – basic

 

 

54,476,000

 

 

 

54,282,000

 

 

 

54,539,000

 

 

 

54,076,000

 

Effect of dilutive securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan

 

 

478,000

 

 

 

819,000

 

 

 

632,000

 

 

 

944,000

 

Shares used in net income per common share – diluted

 

 

54,954,000

 

 

 

55,101,000

 

 

 

55,171,000

 

 

 

55,020,000

 

Net income per common share:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

1.71

 

 

$

1.40

 

 

$

5.89

 

 

$

4.84

 

Diluted

 

$

1.70

 

 

$

1.38

 

 

$

5.82

 

 

$

4.75