XML 83 R66.htm IDEA: XBRL DOCUMENT v3.6.0.2
Common Stock Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 27, 2016
Feb. 28, 2015
Class of Stock [Line Items]            
Dividends paid   $ 205,468 $ 104,628 $ 104,840    
Amount paid for repurchase of common stock   $ 83,593 $ 53,043 $ 26,881    
Common Class B [Member]            
Class of Stock [Line Items]            
Number of shares authorized under share repurchase program         4,000,000 4,000,000
Remaining number of shares authorized to be repurchased 3,900,000 3,900,000        
Treasury Stock [Member]            
Class of Stock [Line Items]            
Repurchased shares   3,053,204 1,696,457 940,417    
SpecialDividend [Member]            
Class of Stock [Line Items]            
Dividends paid $ 102,200          
Common Stock, Dividends, Per Share, Cash Paid $ 1.00