Real Estate Intangibles - Schedule of Future Estimated Aggregate Amortization of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
2019	$ 84,909
2020	101,374
2021	51,215
2022	34,495
2023	28,361
Thereafter	124,848
Net book value	425,202	$ 383,823
Liabilities
2019	4,777
2020	8,835
2021	7,865
2022	7,130
2023	4,989
Thereafter	15,339
Net book value	$ 48,935	$ 45,950