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Stockholders' Equity and Partners' Capital (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Restricted Common Stock Activity
The following is a summary of our restricted common stock activity as of June 30, 2018 and 2017, respectively:
 
June 30, 2018
 
June 30, 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
323,354

 
28.86

 
244,753

 
29.67

Vested
(219,418
)
 
28.97

 
(248,138
)
 
25.15

Forfeited
(28,611
)
 
29.59

 
(47,344
)
 
28.54

Ending balance
664,931

 
$
29.25

 
590,141

 
$
29.19