Significant Acquisitions and Dispositions Dispositions (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) a buildings entities	Dec. 31, 2017 USD ($) sqft buildings entities	Dec. 31, 2016 USD ($) sqft buildings
Dispositions Disclosures [Line Items]
Payments to Acquire Real Estate	$ 348,107	$ 982,598	$ 170,635
Number of Real Estate Properties \| buildings	9	28	18
Proceeds from Sale of Real Estate Held-for-investment	$ 511,391	$ 2,523,358	$ 538,892
Debt Instrument, Interest Rate, Stated Percentage	4.00%	3.38%
Notes receivable from property sales	$ 272,550	$ 426,657
Proceeds from Collection of Notes Receivable	$ 145,000
Area of Land \| a	7
Notes receivable from buyers in property sales	$ 0	$ 404,846	$ 23,360
Number of Real Estate Properties Sold \| buildings	15	98	32
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities	8
Equity in earnings of unconsolidated joint ventures	$ 21,444	$ 63,310	$ 47,403
Promote income	0	20,007	26,299
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations		17,700
Discontinued Operation, Tax Effect of Discontinued Operation	0	12,465	0
Income Tax Expense (Benefit)	8,828	(357)	(589)
Proceeds from Equity Method Investment, Distribution, Return of Capital	$ 23,133	$ 124,956	$ 126,051
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft		3,400,000
London Interbank Offered Rate (LIBOR) [Member]
Dispositions Disclosures [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR
Duke/Quantico LLC [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			14
Duke/Quantico LLC [Member] \| Industrial [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			11
Duke/Quantico LLC [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			3
Duke/Quantico LLC [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment			$ 53,400
Number of Real Estate Properties Sold \| buildings			1
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft			241,000
Medical Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 2,780,000
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Gains (Losses) on Sales of Investment Real Estate		$ 1,390,000
Notes receivable from property sales		$ 400,000
Number of Real Estate Properties Sold \| buildings		85
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities		2
Equity in earnings of unconsolidated joint ventures		$ 47,500
Proceeds from Equity Method Investment, Distribution, Return of Capital		105,300
Continuing Operations [Member]
Dispositions Disclosures [Line Items]
Income Tax Expense (Benefit)		$ 5,200
BCC Cancer Center Venture, L.P. [Member]
Dispositions Disclosures [Line Items]
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities		1

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