Intangibles - Summary of Acquired Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Amortization expense related to in-place leases
Intangibles
Amortization expense related to in-place leases	$ 11,040	$ 8,314
Decrease in rental income related to above-market leases
Intangibles
Decrease of rental income	1,502	927
Increase in rental income related to below-market leases
Intangibles
Increase in rental income related to below-market leases	$ 459	$ 322

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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