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Stockholders' Equity and Partners' Capital (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Restricted Common Stock Activity
The following is a summary of our restricted common stock activity as of December 31, 2018 and 2017, respectively:
 
December 31, 2018
 
December 31, 2017
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
Beginning balance
589,606

 
$
29.38

 
640,870

 
$
27.36

Granted
370,071

 
28.65

 
295,493

 
29.75

Vested
(273,766
)
 
28.50

 
(281,064
)
 
25.33

Forfeited
(61,562
)
 
29.21

 
(65,693
)
 
29.01

Ending balance
624,349

 
$
29.35

 
589,606

 
$
29.38