Real Estate Investments, Net (Summary of Intangible Assets and Liabilities Future Amortization Expense) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense, Remainder 2019	$ 9,748
Finite-lived intangible assets, amortization expense, 2020	11,124
Finite-lived intangible assets, amortization expense, 2021	9,118
Finite-lived intangible assets, amortization expense, 2022	7,244
Finite-lived intangible assets, amortization expense, 2023	6,484
Rental Income
Finite-Lived Intangible Assets [Line Items]
Below market leases, amortization income, Remainder 2019	218
Below market leases, amortization income, 2020	276
Below market leases, amortization income, 2021	563
Below market leases, amortization income, 2022	788
Below market leases, amortization income, 2023	695
In-place leases | Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense, Remainder 2019	9,487
Finite-lived intangible assets, amortization expense, 2020	10,710
Finite-lived intangible assets, amortization expense, 2021	8,704
Finite-lived intangible assets, amortization expense, 2022	6,830
Finite-lived intangible assets, amortization expense, 2023	6,070
Other intangible assets | Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense, Remainder 2019	261
Finite-lived intangible assets, amortization expense, 2020	414
Finite-lived intangible assets, amortization expense, 2021	414
Finite-lived intangible assets, amortization expense, 2022	414
Finite-lived intangible assets, amortization expense, 2023	414
Market lease and other intangible assets | Rental Income
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense, Remainder 2019	(1,216)
Finite-lived intangible assets, amortization expense, 2020	(993)
Finite-lived intangible assets, amortization expense, 2021	(645)
Finite-lived intangible assets, amortization expense, 2022	(307)
Finite-lived intangible assets, amortization expense, 2023	(260)
Below-market lease liabilities | Rental Income
Finite-Lived Intangible Assets [Line Items]
Below market leases, amortization income, Remainder 2019	1,434
Below market leases, amortization income, 2020	1,269
Below market leases, amortization income, 2021	1,208
Below market leases, amortization income, 2022	1,095
Below market leases, amortization income, 2023	$ 955