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Common Stock Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 28, 2015
Dec. 31, 2008
Class of Stock [Line Items]          
Dividends paid $ 104,628 $ 104,840 $ 102,515    
Amount paid for repurchase of common stock $ 53,043 26,881 $ 14,186    
Retirement of treasury stock   $ 0      
Common Class B [Member]          
Class of Stock [Line Items]          
Number of shares authorized under share repurchase program       4,000,000 5,000,000
Remaining number of shares authorized to be repurchased 2,800,000        
Treasury Stock [Member]          
Class of Stock [Line Items]          
Repurchased shares 1,696,457 940,417 645,343    
Retirement of treasury stock, shares   (20,000,000)      
Treasury Stock Value [Member]          
Class of Stock [Line Items]          
Amount paid for repurchase of common stock $ 53,043 $ 26,881 $ 14,186    
Retirement of treasury stock   587,268      
Common Stock [Member]          
Class of Stock [Line Items]          
Retirement of treasury stock   (49,200)      
Retained Earnings [Member]          
Class of Stock [Line Items]          
Retirement of treasury stock   $ (538,068)