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Rent Expense (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Rent Expense        
Number of properties pursuant to ground and parking leases | item 7   7  
Maximum lease terms     67 years  
Future minimum lease obligations under non-cancelable ground leases        
2015 $ 809   $ 809  
2016 1,629   1,629  
2017 1,666   1,666  
2018 1,708   1,708  
2019 1,751   1,751  
Thereafter 32,831   32,831  
Total 40,394   40,394  
Rent expenses for parking and ground leases $ 400 $ 300 $ 800 $ 400