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Equity (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Feb. 28, 2015
Amount paid for repurchase of common stock $ 13,720 $ 9,948  
Class B [Member]      
Number of shares authorized under share repurchase program     4.0
Repurchased shares 1.0    
Remaining number of shares authorized to be repurchased 2.2