Summary of Significant Accounting Policies Deferred Leasing and Other Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Leasing and Other [Abstract]
Deferred leasing costs	$ 376,597,000	$ 359,646,000
Acquired lease-related intangible assets	171,314,000	174,241,000
Deferred Leasing Costs and Finite Lived Intangible Assets Acquired, gross	547,911,000	533,887,000
Accumulated amortization - deferred leasing costs	(122,789,000)	(120,756,000)
Accumulated amortization - acquired lease-related intangible assets	(87,186,000)	(83,366,000)
Deferred Leasing and other costs, net of accumulated amortization	337,936,000	329,765,000
Amortization of Intangible Assets	20,400,000	19,500,000	$ 22,000,000
Amortization of above market lease, charge to rental income	367,000	$ 639,000	$ 703,000
2022	18,168,000
2023	15,271,000
2024	11,986,000
2025	9,789,000
2026	7,574,000
Thereafter	20,576,000
Finite-Lived Intangible Assets, Net	(83,364,000)
2022	352,000
2023	353,000
2024	59,000
2025	0
2026	0
Thereafter	0
Net Charge to Rental Income	$ 764,000