Consolidated Balance Sheets - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Assets
Real Estate Investment Property, Net	$ 4,714,136,000	$ 4,713,091,000
Land held for development	20,168,000	20,168,000
Property under development	76,029,000	42,362,000
Operating Lease, Right-of-Use Asset	200,985,000	180,808,000
Financing Receivable, after Allowance for Credit Loss, Current	457,268,000	370,159,000
Investment in joint ventures	52,964,000	36,670,000
Cash and cash equivalents	107,934,000	288,822,000
Restricted cash	2,577,000	1,079,000
Accounts receivable, net	53,587,000	78,073,000
Other assets	73,053,000	69,918,000
Total assets	5,758,701,000	5,801,150,000
Liabilities:
Accounts payable and accrued liabilities	80,087,000	73,462,000
Operating Lease, Liability	241,407,000	218,795,000
Dividends Payable, Current	21,405,000	18,896,000
Preferred dividends payable	6,033,000	6,034,000
Unearned rents and interest	63,939,000	61,559,000
Debt	2,810,111,000	2,804,365,000
Total liabilities	3,222,982,000	3,183,111,000
Equity:
Common Stock, Value, Issued	825,000	822,000
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Additional paid-in-capital	3,899,732,000	3,876,817,000
Treasury Stock, Value	(269,751,000)	(264,817,000)
Accumulated other comprehensive income	1,897,000	9,955,000
Distributions in excess of net income	(1,097,132,000)	(1,004,886,000)
Equity	2,535,719,000	2,618,039,000
Total liabilities and equity	5,758,701,000	5,801,150,000
Real Estate Investment Property, Accumulated Depreciation	$ 1,302,640,000	$ 1,167,734,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	82,545,501	82,225,061
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	25,000,000	25,000,000
Treasury Stock, Shares	7,520,227	7,416,746
Series C Preferred Shares [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	$ 54,000	$ 54,000
Preferred Stock, Shares Issued	5,392,916	5,392,916
Auction Market Preferred Securities, Stock Series, Liquidation Value		$ 134,822,900
Series E Preferred Shares [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	$ 34,000	$ 34,000
Preferred Stock, Shares Issued	3,447,381	3,447,381
Auction Market Preferred Securities, Stock Series, Liquidation Value	$ 86,184,525	$ 86,184,525
Series G Preferred Stock [Member]
Preferred shares, $.01 par value; 25,000,000 shares authorized:
Preferred shares	$ 60,000	$ 60,000
Preferred Stock, Shares Issued	6,000,000	6,000,000
Auction Market Preferred Securities, Stock Series, Liquidation Value	$ 150,000,000	$ 150,000,000