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Goodwill, Deferred Leasing Costs and Other Intangibles - Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2018 USD ($)
(Decrease) Increase to rental income
2019	$ 10,761
2020	9,553
2021	9,769
2022	8,811
2023	9,003
2024 and Thereafter	(1,873)
Net increase (decrease) to rental income	46,024
Deferred Leasing Costs and Intangible Assets
2019	133,063
2020	56,409
2021	44,376
2022	36,186
2023	31,563
2024 and Thereafter	79,913
Net Carrying Amount	381,510
Net below-market ground lease obligations
Deferred Leasing Costs and Intangible Assets
2019	(226)
2020	(224)
2021	(219)
2022	(216)
2023	(224)
2024 and Thereafter	1,883
Net Carrying Amount	$ 774

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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