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Rent Expense (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
properties
healthcareproperty
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
properties
healthcareproperty
Jun. 30, 2015
USD ($)
Number of properties subject to parking lease | properties 3   3  
Number of properties subject to air space lease | healthcareproperty 1   1  
Number of properties subject to ground leases | properties 52   52  
Maximum lease terms     90 years  
Rent expenses for parking, air, and ground leases $ 400 $ 400 $ 800 $ 800
Future minimum lease obligations under non-cancelable parking, air, and ground leases        
2016 1,049   1,049  
2017 2,134   2,134  
2018 2,189   2,189  
2019 2,239   2,239  
2020 2,290   2,290  
Thereafter 57,404   57,404  
Total $ 67,305   $ 67,305