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Significant Acquisitions and Dispositions (Narrative) (Details) $ in Thousands, sqft in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) buildings	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) buildings	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) buildings	Dec. 31, 2018 USD ($) buildings	Dec. 31, 2017 USD ($) a sqft buildings
Business Acquisition [Line Items]
Payments to Acquire Real Estate										$ (210,224)	$ (348,107)	$ (982,598)
Number of Real Estate Properties \| buildings		6				9				6	9	28
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings		$ 205,390				$ 328,126				$ 205,390	$ 328,126	$ 945,844
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		217,106				353,122				$ 217,106	$ 353,122	$ 992,651
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life										6 years 6 months	11 years 3 months 18 days	8 years 8 months 12 days
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		11,716				24,996				$ 11,716	$ 24,996	$ 46,807
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other						505					505	1,483
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net						352,617					352,617	$ 991,168
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft												3.4
Percentage of property leased												68.90%
Proceeds from Sale of Real Estate Held-for-investment										$ 432,662	$ 511,391	$ 2,523,358
Number of Real Estate Properties Sold	18									28	15	98
Proceeds from Sale of Productive Assets	$ 217,500
Rental and related revenue		217,387	$ 215,374	$ 213,107	$ 209,965	202,858	$ 196,912	$ 192,093	$ 193,456	$ 855,833	$ 785,319	$ 686,514
Operating Income (Loss)										524,761	460,356	388,621
Promote income										0	0	20,007
Investments in and advances to unconsolidated joint ventures		$ 133,074				$ 110,795				133,074	110,795
Gain (Loss) on Sale of Properties	$ 146,300									$ 242,543	$ 219,114	1,480,691
Square Feet of Properties Sold	4,100,000
Bridge Portfolio [Member]
Business Acquisition [Line Items]
Payments to Acquire Real Estate												$ (578,400)
Number of Real Estate Properties \| buildings												10
Area of Land \| a												43