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Equity, Earnings Per Share ("EPS") (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Basic            
Net income attributable to common stockholders $ 16,420,958 $ 10,888,172 $ 43,964,070 $ 22,261,516    
Weighted average shares outstanding (in shares) 61,582,796 51,390,467 56,602,504 51,272,795    
Net income per common share (in dollars per share) $ 0.27 $ 0.21 $ 0.78 $ 0.43    
Diluted            
Net income attributable to noncontrolling interest $ 5,661,184 $ 3,649,432 $ 16,596,415 $ 3,649,432    
Net income attributable to common stockholders and noncontrolling interest $ 22,082,142 $ 14,537,604 $ 60,560,485 $ 22,261,516    
Weighted average shares outstanding (in shares) 61,582,796 51,390,467 56,602,504 51,272,795    
Dilutive effect of OP units (in shares) 21,230,769 18,230,769 21,230,769      
Dilutive effect of restricted stock units (in shares) 1,104,552 650,560 1,077,178 354,755    
Dilutive effect of convertible senior unsecured notes (in shares)     32,468      
Weighted average shares outstanding ( in shares) 83,918,117 70,271,796 78,942,919 51,627,550    
Net income per common share (in dollars per share) $ 0.26 $ 0.21 $ 0.77 $ 0.43    
Performance            
Diluted            
Vesting period (in years)     3 years      
Chief executive officer | Performance            
Diluted            
Vesting period (in years)     4 years   4 years 4 years