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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income $ 19,826 $ 16,632
Undistributed income 19,826 16,632
Allocation of net income:    
Allocation of undistributed income 19,826 16,632
Class A [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income 19,265 16,162
Dividends 0 0
Undistributed income 19,265 16,162
Allocation of net income:    
Dividends 0 0
Allocation of undistributed income 19,265 16,162
Denominator:    
Basic earnings per share - weighted-average shares (in shares) 3,435 3,435
Effect of dilutive stock options (in shares) 2 5
Diluted earnings per share - adjusted weighted-average shares for assumed conversions (in shares) 3,437 3,440
Basic Earnings Per Share (in dollars per share) $ 5.61 $ 4.71
Diluted Earnings Per Share (in dollars per share) $ 5.61 $ 4.70
Class B [Member]
   
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income 561 470
Dividends 0 0
Undistributed income 561 470
Allocation of net income:    
Dividends 0 0
Allocation of undistributed income $ 561 $ 470
Denominator:    
Basic earnings per share - weighted-average shares (in shares) 200 200
Effect of dilutive stock options (in shares) 0 0
Diluted earnings per share - adjusted weighted-average shares for assumed conversions (in shares) 200 200
Basic Earnings Per Share (in dollars per share) $ 2.80 $ 2.35
Diluted Earnings Per Share (in dollars per share) $ 2.80 $ 2.35