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Equity-Based Compensation - Stock Options (Details) - Stock Options
6 Months Ended
Jun. 30, 2016
Share-based Compensation  
Stock options exercisable cumulative annual installments period 10 years
Vesting period 4 years
Stock option contractual term 10 years
Minimum  
Share-based Compensation  
Stock option exercises, commencement period from date of grant P1Y