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Intangibles - Summary of Acquired Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
In-place lease intangible        
Intangibles        
Amortization expense related to in-place leases $ 8,327 $ 6,746 $ 17,066 $ 12,435
Above market in-place lease intangible        
Intangibles        
Decrease of rental income 1,263 1,059 2,652 2,046
Decrease of rental income related to leasehold interest        
Intangibles        
Decrease of rental income 15 15 29 30
Below market in-place lease intangible        
Intangibles        
Increase of rental income related to below-market leases 511 322 1,080 548
Decrease of operating expense related to above market ground leases        
Intangibles        
Decrease (increase) of operating expense 7 5 15 9
Below market in-place ground lease        
Intangibles        
Decrease (increase) of operating expense $ 188 $ 94 $ 373 $ 141