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Equity (Details) - USD ($)
$ in Thousands, shares in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Feb. 28, 2015
Amount paid for repurchase of common stock $ 41,014 $ 20,492    
Other current liabilities 13,342   $ 14,466  
Treasury Stock [Member]        
Amount paid for repurchase of common stock 41,014 $ 20,492    
Other current liabilities $ 5,800      
Class B [Member]        
Number of shares authorized under share repurchase program       4.0
Repurchased shares 1.4      
Remaining number of shares authorized to be repurchased 1.3