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Stock-Based Compensation - Change in Incentive Units (Details) - Incentive Units - Common Class A
shares in Thousands
3 Months Ended
Mar. 31, 2017
shares
Vested  
Beginning balance (in shares) 16
Issued (in shares) 0
Vested (in shares) (1)
Exercised (in shares) 0
Canceled (in shares) 0
Ending balance (in shares) 15