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Equity Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Summary of Outstanding OP Units and Unvested Class B Units
Below is a summary of our number of outstanding OP units and unvested Class B units as of December 31, 2017 and 2016 (in thousands):
 
2017
 
2016
OP units
44,454

 
2,785

Class B units(1)

 
2,610