Deferred Costs, Acquired Lease Intangibles and Goodwill - Future Amortization Expense and Rental Revenue (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Future Rental Revenue [Abstract]
2019	$ 6,875
2020	3,651
2021	2,868
2022	3,185
2023	3,181
Thereafter	9,532
Future Rental Revenue	29,292
Ground lease
Future Amortization Expense [Abstract]
2019	7,831
2020	7,831
2021	7,831
2022	7,831
2023	7,831
Thereafter	321,243
Future Amortization Expense	360,398
Lease agreements
Future Amortization Expense [Abstract]
2019	15,829
2020	12,967
2021	11,250
2022	10,433
2023	9,756
Thereafter	31,690
Future Amortization Expense	$ 91,925