Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021		Mar. 30, 2021
Schedule of Equity Method Investments [Line Items]
Total revenue		$ 754,307	$ 713,695
Expenses
Transaction costs		0	331
Depreciation and amortization		177,624	176,565
Total expenses		499,978	484,800
Loss from early extinguishment of debt		0	(898)
Other income (expense)
Interest expense		(101,228)	(107,902)
Gains on sales of real estate		22,701	0
Net income		176,957	128,147
Income (Loss) from Equity Method Investments		2,189	5,225
Above and below market rent adjustments, net		4,200
Write-off for accrued rent and accounts receivables		(1,000)	400
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	[1]	124,491	87,266
Expenses
Operating		45,641	37,134
Transaction costs		0	7
Depreciation and amortization		44,664	34,103
Total expenses		90,305	71,244
Loss from early extinguishment of debt		(1,327)	0
Other income (expense)
Interest expense		(30,373)	(25,556)
Net income		2,486	(9,534)
Company's share of net income		3,394	(3,640)
Gain on Sale of Investments		0	10,257	[2]
Basis differential	[3]	(1,205)	(1,392)
Income (Loss) from Equity Method Investments		2,189	5,225
Straight-line rent adjustments		27,500	1,100
Write-off for accrued rent and accounts receivables		(2,500)	300
Annapolis Junction NFM, LLC [Member]
Other income (expense)
Gain on Sale of Investments			10,300
Ownership Percentage					50.00%
Colorado Center [Member]
Other income (expense)
Straight-line rent adjustments		100	500
Above and below market rent adjustments, net		$ 100	$ 100

[1] Includes straight-line rent adjustments of approximately $27.5 million and $1.1 million for the three months ended March 31, 2022 and 2021, respectively. For the three months ended March 31, 2022, reinstatement of accrued rent balances totaled approximately $2.5 million. For the three months ended March 31, 2021, write-offs of accounts receivable and accrued rent balances totaled approximately $0.3 million.

[2] During the three months ended March 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.

[3] Includes straight-line rent adjustments of approximately $0.1 million and $0.5 million for the three months ended March 31, 2022 and 2021, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million and $0.1 million for the three months ended March 31, 2022 and 2021, respectively.