Real Estate Investments - Assets Held for Sale (Details) $ in Thousands	Jul. 09, 2021 USD ($) property	Jun. 30, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Balance Sheet Related Disclosures [Abstract]
Land		$ 375,374	$ 362,695
Building, improvements and lease intangibles		4,249,352	4,220,297
Personal property		11,589	11,195
Total real estate properties		4,769,330	4,621,413
Accumulated depreciation		(1,285,251)	(1,239,224)
Total real estate properties, net		3,484,079	3,382,189
Assets held for sale, net		21,065	20,646
Liabilities of assets held for sale		942	1,216
Disposal Group, Held-for-sale, Not Discontinued Operations
Balance Sheet Related Disclosures [Abstract]
Land		1,664	1,664
Building, improvements and lease intangibles		27,466	27,443
Personal property		39	39
Total real estate properties		29,169	29,146
Accumulated depreciation		(10,444)	(10,455)
Total real estate properties, net		18,725	18,691
Other assets, net		2,340	1,955
Assets held for sale, net		21,065	20,646
Accounts payable and accrued liabilities		622	533
Other liabilities		320	683
Liabilities of assets held for sale		942	$ 1,216
Real Estate Dispositions
Long Lived Assets Held-for-sale [Line Items]
Disposition sales price		91,550
Net real estate investment		$ 47,049
Real Estate Dispositions \| Subsequent event \| Dallas, TX
Long Lived Assets Held-for-sale [Line Items]
Number of properties sold \| property	4
Disposition sales price	$ 23,000
Net real estate investment	$ 18,700
Asset Held-for-sale
Long Lived Assets Held-for-sale [Line Items]
Number of properties held for sale \| property		4	4

Assets held for sale and discontinued operations, net.

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Amount classified as accounts payable and accrued liabilities attributable to disposal group held for sale or disposed of.

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