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Earnings Per Share
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Note 3.  Earnings Per Share
 
Class A and Class B basic earnings per share and Class B diluted earnings per share are calculated under the two-class method. The two-class method allocates earnings to each class of stock based upon its dividend rights.  Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1. See Note 9, "Capital Stock".

Class A diluted earnings per share are calculated under the if-converted method, which reflects the conversion of Class B shares to Class A shares. Diluted earnings per share calculations include the dilutive effect of assumed issuance of stock-based awards under compensation plans that have the option to be paid in stock using the treasury stock method.

A reconciliation of the numerators and denominators used in the basic and diluted per-share computations is presented as follows for each class of common stock:
 
 
 
Three months ended September 30,
 
 
2017
 
2016
(dollars in thousands, except per share data)
 
Allocated net income (numerator)
 
Weighted shares (denominator)
 
Per-share amount
 
Allocated net income (numerator)
 
Weighted shares (denominator)
 
Per-share amount
Class A – Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
 
Income available to Class A stockholders
 
$
58,064

 
46,188,949

 
$
1.26

 
$
56,906

 
46,188,980

 
$
1.23

Dilutive effect of stock-based awards
 
0

 
27,127

 

 
0

 
121,523

 

Assumed conversion of Class B shares
 
479

 
6,100,800

 

 
470

 
6,100,800

 

Class A – Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
 
Income available to Class A stockholders on Class A equivalent shares
 
$
58,543

 
52,316,876

 
$
1.12

 
$
57,376

 
52,411,303

 
$
1.09

Class B – Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
 
Income available to Class B stockholders
 
$
479

 
2,542

 
$
189

 
$
470

 
2,542

 
$
185

Class B – Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
 
Income available to Class B stockholders
 
$
479

 
2,542

 
$
189

 
$
469

 
2,542

 
$
185

 
 
Nine months ended September 30,
 
 
2017
 
2016
(dollars in thousands, except per share data)
 
Allocated net income (numerator)
 
Weighted shares (denominator)
 
Per-share amount
 
Allocated net income (numerator)
 
Weighted shares (denominator)
 
Per-share amount
Class A – Basic EPS:
 
 

 
 

 
 

 
 

 
 

 
 

Income available to Class A stockholders
 
$
163,596

 
46,186,109

 
$
3.54

 
$
163,233

 
46,188,971

 
$
3.53

Dilutive effect of stock-based awards
 
0

 
55,541

 

 
0

 
152,926

 

Assumed conversion of Class B shares
 
1,350

 
6,100,800

 

 
1,347

 
6,100,800

 

Class A – Diluted EPS:
 
 

 
 

 
 

 
 

 
 

 
 

Income available to Class A stockholders on Class A equivalent shares
 
$
164,946

 
52,342,450

 
$
3.15

 
$
164,580

 
52,442,697

 
$
3.14

Class B – Basic EPS:
 
 

 
 

 
 

 
 

 
 

 
 

Income available to Class B stockholders
 
$
1,350

 
2,542

 
$
531

 
$
1,347

 
2,542

 
$
530

Class B – Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
 
Income available to Class B stockholders
 
$
1,350

 
2,542

 
$
531

 
$
1,346

 
2,542

 
$
529