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Stockholders' Equity and Partners' Capital (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Restricted Common Stock Activity
The following is a summary of our restricted common stock activity as of December 31, 2017 and 2016, respectively:
 
December 31, 2017
 
December 31, 2016
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
Beginning balance
640,870

 
$
27.36

 
487,850

 
$
23.13

Granted
295,493

 
29.75

 
417,110

 
29.82

Vested
(281,064
)
 
25.33

 
(237,999
)
 
23.28

Forfeited
(65,693
)
 
29.01

 
(26,091
)
 
26.09

Ending balance
589,606

 
$
29.38

 
640,870

 
$
27.36