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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2017
Mar. 31, 2017
Treasury stock, shares 8,124,611 7,013,777
Common stock, Class A    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 156,800,716 155,901,485
Common stock, shares outstanding 148,676,105 148,887,708