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Redeemable Noncontrolling Interests in Operating Partnership (Tables)
12 Months Ended
Dec. 31, 2017
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]  
Summary of the activity of the operating partnership units
A summary of the activity of the units in our operating partnership is as follows (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Units outstanding at beginning of year
4,943

 
4,375

 
8,955

LTIP units issued
149

 
4

 
10

Performance-based LTIP units issued
281

 
701

 

Units redeemed for shares of common stock
(194
)
 
(137
)
 
(4,245
)
Units redeemed for cash of $5,856 in 2015

 

 
(345
)
Performance-based LTIP units forfeited
(389
)
 

 

Units outstanding at end of year
4,790

 
4,943

 
4,375

Units convertible/redeemable at end of year
4,028

 
4,083

 
3,967