Real Estate Intangibles - Schedule of Future Estimated Aggregate Amortization of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
2019	$ 37,833
2020	103,599
2021	53,156
2022	36,057
2023	29,858
Thereafter	138,252
Net book value	398,755	$ 383,823
Liabilities
2019	2,390
2020	8,868
2021	7,899
2022	7,163
2023	5,031
Thereafter	15,709
Net book value	$ 47,060	$ 45,950