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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
 
Three Months Ended March 31,
 
2013
 
2012
 
Class A
 
Class B
 
Class A
 
Class B
 
(In thousands except per share amounts)
 
 
 
 
 
 
 
 
Numerator for Basic and Diluted Earnings Per Share:
 
 
 
 
 
 
 
Net income
$
16,632

 
 
 
19,741

 
 
Dividends - Class A shares
—

 
 
 
—

 
 
Dividends - Class B shares
—

 
 
 
—

 
 
 
 
 
 
 
 
 
 
Undistributed income
$
16,632

 
 
 
19,741

 
 
 
 
 
 
 
 
 
 
Allocation of net income:
 

 
 
 
 

 
 
Dividends
$
—

 
—

 
—

 
—

Allocation of undistributed income
16,162

 
470

 
19,183

 
558

 
 
 
 
 
 
 
 
Net income
$
16,162

 
470

 
19,183

 
558

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Basic earnings per share - weighted-average shares
3,435

 
200

 
3,435

 
200

Effect of dilutive stock options
5

 
—

 
—

 
—

 
 
 
 
 
 
 
 
Diluted earnings per share - adjusted weighted-average shares for assumed conversions
3,440

 
200

 
3,435

 
200

 
 
 
 
 
 
 
 
Basic Earnings Per Share
$
4.71

 
2.35

 
5.58

 
2.79

 
 
 
 
 
 
 
 
Diluted Earnings Per Share
$
4.70

 
2.35

 
5.58

 
2.79