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Intangibles - Summary of Acquired Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
In-place lease intangible        
Intangibles        
Amortization expense related to in-place leases $ 9,453 $ 7,420 $ 26,520 $ 19,855
Above market in-place lease intangible        
Intangibles        
Decrease of rental income 1,335 1,276 3,987 3,322
Decrease of rental income related to leasehold interest        
Intangibles        
Decrease of rental income 15 15 44 45
Below market in-place lease intangible        
Intangibles        
Increase of rental income related to below-market leases 623 670 1,704 1,218
Decrease of operating expense related to above market ground leases        
Intangibles        
Decrease (increase) of operating expense 34 8 49 17
Below market in-place ground lease        
Intangibles        
Decrease (increase) of operating expense $ 208 $ 158 $ 581 $ 299