Real Estate Intangibles (Future Estimated Aggregate Amortization of Intangible Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
2019	$ 97,199
2020	62,641
2021	29,855
2022	24,270
2023	20,304
Thereafter	149,554
Totals	383,823	$ 377,034
Liabilities
2019	7,005
2020	6,475
2021	5,838
2022	5,300
2023	3,440
Thereafter	17,892
Totals	$ 45,950	$ 29,341