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Stock-Based Compensation - Stock Options (Details) - Stock Options - $ / shares
1 Months Ended 3 Months Ended
May. 31, 2015
Mar. 31, 2014
Mar. 31, 2016
Stock Options      
Minimum age requirement of grantee as a condition for vesting     65 years
Contractual term     10 years
Granted (in dollars per share)     $ 12.72
Weighted average fair value (in dollars per share) $ 3.79 $ 10.08  
Awards that vest after two years      
Stock Options      
Vesting period for awards     2 years
Percentage of granted awards that will vest     50.00%
Awards that vest after three years      
Stock Options      
Vesting period for awards     3 years
Percentage of granted awards that will vest     50.00%