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Stockholders' Equity and Partners' Capital (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Restricted Common Stock Activity The following is a summary of our restricted common stock activity as of March 31, 2019 and 2018, respectively:
 
March 31, 2019
 
March 31, 2018
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
Beginning balance
624,349

 
$
29.35

 
589,606

 
$
29.38

Granted
294,072

 
25.86

 
307,534

 
29.05

Vested
(291,857
)
 
28.46

 
(205,270
)
 
29.13

Forfeited
(1,580
)
 
29.31

 
(20,061
)
 
29.66

Ending balance
624,984

 
$
28.12

 
671,809

 
$
29.29