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Net Income Per Share of Class A and Class B Common Stock (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Three Months Ended June 30,
 
2017
 
2016
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
50,520

 
$
2,680

 
$
47,869

 
$
3,559

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
 
340

 
—

 
440

 
—

Conversion of Class B common shares into Class A common shares
 
2,334

 
—

 
3,109

 
—

Effect of dilutive stock options on net income
 
5

 
(5
)
 
9

 
(9
)
Net income applicable to common stockholders - diluted
 
$
53,200

 
$
2,674

 
$
51,428

 
$
3,549

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,791

 
1,262

 
23,700

 
1,762

Conversion of Class B common shares into Class A common shares
 
1,262

 
—

 
1,762

 
—

Effect of dilutive stock options on weighted average common shares
 
53

 
—

 
72

 
—

Weighted average common shares outstanding – diluted
 
25,106

 
1,262

 
25,534

 
1,762

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
2.12

 
$
2.12

 
$
2.02

 
$
2.02

Net income per common share - diluted
 
$
2.12

 
$
2.12

 
$
2.01

 
$
2.01

  
Three Months Ended June 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
 
22

 
—

 
—

 
—

Six Months Ended June 30,
 
2017
 
2016
(in thousands, except per share data)
 
Class A
 
Class B
 
Class A
 
Class B
Net income applicable to common stockholders - basic
 
$
98,337

 
$
5,590

 
$
84,445

 
$
7,253

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

 
(2
)
 
5

 
(5
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
 
700

 
—

 
907

 
—

Conversion of Class B common shares into Class A common shares
 
4,876

 
—

 
6,313

 
—

Effect of dilutive stock options on net income
 
12

 
(12
)
 
28

 
(28
)
Net income applicable to common stockholders - diluted
 
$
103,927

 
$
5,576

 
$
91,698

 
$
7,220

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
 
23,765

 
1,351

 
23,611

 
2,028

Conversion of Class B common shares into Class A common shares
 
1,351

 
—

 
2,028

 
—

Effect of dilutive stock options on weighted average common shares
 
61

 
—

 
115

 
—

Weighted average common shares outstanding – diluted
 
25,177

 
1,351

 
25,754

 
2,028

 
 
 
 
 
 
 
 
 
Net income per common share - basic
 
$
4.14

 
$
4.14

 
$
3.58

 
$
3.58

Net income per common share - diluted
 
$
4.13

 
$
4.13

 
$
3.56

 
$
3.56

Six Months Ended June 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
 
11

 
—

 
10

 
—