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Net Income Per Share of Class A and Class B Common Stock (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
2018
 
2017
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
58,213

 
$
2,447

 
$
50,520

 
$
2,680

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

 
(1
)
 
1

 
(1
)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding
 
289

 
—

 
340

 
—

Conversion of Class B common shares into Class A common shares
 
2,149

 
—

 
2,334

 
—

Effect of dilutive stock options on net income
 
8

 
(8
)
 
5

 
(5
)
Net income applicable to common stockholders - diluted
 
$
60,660

 
$
2,438

 
$
53,200

 
$
2,674

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,793

 
1,000

 
23,791

 
1,262

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

 
—

 
1,262

 
—

Effect of dilutive stock options on weighted average common shares
 
89

 
—

 
53

 
—

Weighted average common shares outstanding – diluted
 
24,882

 
1,000

 
25,106

 
1,262

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
2.45

 
$
2.45

 
$
2.12

 
$
2.12

Net income per common share - diluted
 
$
2.44

 
$
2.44

 
$
2.12

 
$
2.12

  
Three Months Ended June 30,
 
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
 
30

 
—

 
22

 
—

Six Months Ended June 30,
 
2018
 
2017
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
108,199

 
$
4,522

 
$
98,337

 
$
5,590

Reallocation of distributed net income as a result of conversion of dilutive stock options
 
2

 
(2
)
 
2

 
(2
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
 
557

 
—

 
700

 
—

Conversion of Class B common shares into Class A common shares
 
3,947

 
—

 
4,876

 
—

Effect of dilutive stock options on net income
 
16

 
(16
)
 
12

 
(12
)
Net income applicable to common stockholders - diluted
 
$
112,721

 
$
4,504

 
$
103,927

 
$
5,576

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,930

 
1,000

 
23,765

 
1,351

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

 
—

 
1,351

 
—

Effect of employee stock purchases and restricted stock units on weighted average common shares
 
98

 
—

 
61

 
—

Weighted average common shares outstanding – diluted
 
25,028

 
1,000

 
25,177

 
1,351

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
4.52

 
$
4.52

 
$
4.14

 
$
4.14

Net income per common share - diluted
 
$
4.50

 
$
4.50

 
$
4.13

 
$
4.13

Six Months Ended June 30,
 
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
 
56

 
—

 
11

 
—