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Equity - Restricted Stock and performance-based stock units (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restricted stock and performance-based stock units    
Restricted stock and performance based stock units activity    
Outstanding at the beginning of the year (in shares) 325,750 244,181
Granted (in shares) 139,112 147,990
Vested (in shares) (117,997) (61,733)
Outstanding at the end of the year (in shares) 346,865 330,438
Performance-based stock units    
Restricted stock and performance based stock units activity    
Vested (in shares) (48,225)