Leases - Activity for Reserves Related to Billed Rents and Straight-line Rents (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Operating Leased Assets [Line Items]
Balance at Beginning of Period	$ 45,408
Provision (Recovery)	1,824
Adjustments to Valuation Accounts	0
Deductions	(4,968)
Balance at End of Period	42,264
Allowance for Credit Loss - Billed Rents
Operating Leased Assets [Line Items]
Balance at Beginning of Period	30,366
Provision (Recovery)	1,238
Adjustments to Valuation Accounts	0
Deductions	(2,639)
Balance at End of Period	28,965
Straight-line Rent Reserves
Operating Leased Assets [Line Items]
Balance at Beginning of Period	15,042
Provision (Recovery)	586
Adjustments to Valuation Accounts	0
Deductions	(2,329)
Balance at End of Period	$ 13,299