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Equity - Shares of Common Stock Outstanding (Details)
 3 Months Ended
Jun. 30, 2018
shares
Common Class A  
Common Stock, Shares Outstanding [Roll Forward]  
Outstanding, beginning of period (in shares) 23,139,476
Shares repurchased for employee tax withholdings (in shares) (3,328)
Forfeitures of restricted stock (in shares) (8,857)
Outstanding, end of period (in shares) 23,127,291
Common Class B  
Common Stock, Shares Outstanding [Roll Forward]  
Outstanding, beginning of period (in shares) 25,700,068
Shares repurchased for employee tax withholdings (in shares) 0
Forfeitures of restricted stock (in shares) 0
Outstanding, end of period (in shares) 25,700,068