Real Estate Investments and Related Intangibles - Consolidated Joint Ventures Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019 USD ($) property joint_venture	Dec. 31, 2018 USD ($) property joint_venture
Schedule of Equity Method Investments [Line Items]
Number of Properties \| property	3,951
Total assets	$ 13,781,884	$ 13,963,493
Real estate investments, net	$ 11,555,137	12,168,067
Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties \| property	414
Aggregate balance outstanding	$ 1,742,407	$ 1,917,132
Joint ventures [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint ventures \| joint_venture	1	1
Total assets	$ 32,100	$ 32,500
Real estate investments, net	$ 29,600	$ 29,900
Joint ventures [Member] \| Consolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties \| property	1	1
Joint ventures [Member] \| Consolidated Properties [Member] \| Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Aggregate balance outstanding	$ 13,900	$ 14,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The number of real estate properties owned as of the balance sheet date.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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