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Rent Expense (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
properties
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
properties
Sep. 30, 2014
USD ($)
Leases [Abstract]        
Number of properties pursuant to parking lease | properties 1   1  
Number of properties pursuant to ground and parking leases | properties 14   14  
Maximum lease terms     90 years  
Future minimum lease obligations under non-cancelable ground leases        
2015 $ 403   $ 403  
2016 1,629   1,629  
2017 1,666   1,666  
2018 1,708   1,708  
2019 1,751   1,751  
Thereafter 32,794   32,794  
Total 39,951   39,951  
Rent expenses for parking and ground leases $ 400 $ 300 $ 1,200 $ 700