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Net Income Per Share of Class A and Class B Common Stock (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30,
 
2017
 
2016
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
49,687

 
$
2,199

 
$
50,262

 
$
3,779

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
 
285

 
—

 
439

 
—

Conversion of Class B common shares into Class A common shares
 
1,908

 
—

 
3,326

 
—

Effect of dilutive stock options on net income
 
5

 
(5
)
 
13

 
(13
)
Net income applicable to common stockholders - diluted
 
$
51,886

 
$
2,193

 
$
54,041

 
$
3,765

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,948

 
1,060

 
23,432

 
1,762

Conversion of Class B common shares into Class A common shares
 
1,060

 
—

 
1,762

 
—

Effect of dilutive stock options on weighted average common shares
 
68

 
—

 
96

 
—

Weighted average common shares outstanding – diluted
 
25,076

 
1,060

 
25,290

 
1,762

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
2.07

 
$
2.07

 
$
2.15

 
$
2.15

Net income per common share - diluted
 
$
2.07

 
$
2.07

 
$
2.14

 
$
2.14

  
Three Months Ended September 30,
 
2017
 
2016
Diluted EPS
 
Class A
 
Class B
 
Class A
 
Class B
Antidilutive Securities
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
 
9

 
—

 
—

 
—

Nine Months Ended September 30,
 
2017
 
2016
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
147,876

 
$
7,937

 
$
134,533

 
$
11,206

Reallocation of distributed net income as a result of conversion of dilutive stock options
 
3

 
(3
)
 
5

 
(5
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
 
1,006

 
—

 
1,365

 
—

Conversion of Class B common shares into Class A common shares
 
6,909

 
—

 
9,794

 
—

Effect of dilutive stock options on net income
 
19

 
(19
)
 
42

 
(42
)
Net income applicable to common stockholders - diluted
 
$
155,813

 
$
7,915

 
$
145,739

 
$
11,159

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,812

 
1,278

 
23,530

 
1,960

Conversion of Class B common shares into Class A common shares
 
1,278

 
—

 
1,960

 
—

Effect of dilutive stock options on weighted average common shares
 
68

 
—

 
108

 
—

Weighted average common shares outstanding – diluted
 
25,158

 
1,278

 
25,598

 
1,960

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
6.21

 
$
6.21

 
$
5.72

 
$
5.72

Net income per common share - diluted
 
$
6.19

 
$
6.19

 
$
5.69

 
$
5.69

Nine Months Ended September 30,
 
2017
 
2016
Diluted EPS
 
Class A
 
Class B
 
Class A
 
Class B
Antidilutive Securities
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
 
10

 
—

 
—

 
—