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Net Income Per Share of Class A and Class B Common Stock (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Following is a reconciliation of net income and weighted average shares used for our basic earnings per share (“EPS”) and diluted EPS (in thousands, except per share amounts):
Three Months Ended March 31,
 
2018
 
2017
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
49,983

 
$
2,078

 
$
47,826

 
$
2,901

Reallocation of distributed net income as a result of conversion of dilutive stock options
 
1

 
(1
)
 
1

 
(1
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
 
269

 
—

 
359

 
—

Conversion of Class B common shares into Class A common shares
 
1,801

 
—

 
2,534

 
—

Effect of dilutive stock options on net income
 
7

 
(7
)
 
7

 
(7
)
Net income applicable to common stockholders - diluted
 
$
52,061

 
$
2,070

 
$
50,727

 
$
2,893

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
24,050

 
1,000

 
23,740

 
1,440

Conversion of Class B common shares into Class A common shares
 
1,000

 
—

 
1,440

 
—

Effect of employee stock purchases and restricted stock units on weighted average common shares
 
108

 
—

 
70

 
—

Weighted average common shares outstanding – diluted
 
25,158

 
1,000

 
25,250

 
1,440

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
2.08

 
$
2.08

 
$
2.01

 
$
2.01

Net income per common share - diluted
 
$
2.07

 
$
2.07

 
$
2.01

 
$
2.01

Three Months Ended March 31,
 
2018
 
2017
Diluted EPS
 
Class A
 
Class B
 
Class A
 
Class B
Antidilutive Securities
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
 
26

 
—

 
—

 
—