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Leases - Activity for Reserves Related to Billed Rents and Straight-line Rents (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Operating Leased Assets [Line Items]
Balance at Beginning of Period	$ 45,408
Provision (Recovery)	1,227
Write-Offs	(5,557)
Balance at End of Period	41,078
Allowance for Credit Loss - Billed Rents
Operating Leased Assets [Line Items]
Balance at Beginning of Period	30,366
Provision (Recovery)	973
Write-Offs	(2,909)
Balance at End of Period	28,430
Straight-line Rent Reserves
Operating Leased Assets [Line Items]
Balance at Beginning of Period	15,042
Provision (Recovery)	254
Write-Offs	(2,648)
Balance at End of Period	$ 12,648