Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan (Details)

v3.19.3
Equity Incentive Plan (Details) - $ / shares
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted common shares reserved for issuance under equity incentive plan (in shares) 6,500,000  
Number of restricted common shares granted during period under equity incentive plan (in shares) 515,282 996,924
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) $ 14.28 $ 14.96
Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted common shares granted during period under equity incentive plan (in shares) 60,108 55,553
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) $ 13.35 $ 15.48
Key Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted common shares granted during period under equity incentive plan (in shares) 455,174 941,371
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) $ 14.40 $ 15.12
Award vesting period of restricted common shares granted during period under equity incentive plan 3 years