Investments in Unconsolidated Companies (Summarized Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Rental and related revenue	$ 1,025,663	$ 929,194	$ 855,833
Net income	861,618	302,760	432,644
Equity in earnings of unconsolidated joint ventures	32,804	11,944	31,406
Total Assets	10,445,655	9,111,394
Total Liabilities	4,306,694	3,876,946
Total Liabilities and Equity	10,445,655	9,111,394
Investments in and advances to unconsolidated joint ventures	168,336	131,898
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	3,800	2,700
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Rental and related revenue	67,142	57,952	59,905
Gains on land and property sales - continuing operations	64,480	2,076	24,099
Net income	85,323	19,183	$ 40,134
Land, buildings and tenant improvements, net	625,206	321,803
Construction in progress	31,745	23,507
Undeveloped land	3,326	23,653
Other assets	106,521	79,842
Total Assets	766,798	448,805
Indebtedness	286,430	155,539
Other liabilities	45,580	31,946
Total Liabilities	332,010	187,485
Members' Equity	434,788	261,320
Total Liabilities and Equity	$ 766,798	$ 448,805