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Impairment and Disposal of Long-Lived Assets - Discontinued Operations (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) a	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) a	Jun. 30, 2018 USD ($)	Jun. 30, 2019 properties	Jun. 30, 2019 bldg	Dec. 31, 2018 bldg
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income taxes	$ 261	$ (911)	$ (571)	$ (1,440)
Loss on debt extinguishment			(7,618)	0
Gain (loss) on property dispositions	41,200	200	50,100	(89,800)
Income from discontinued operations	48,239	12,712	63,766	115,220
Noncontrolling interest - consolidated joint ventures	(123)	(691)	(167)	(778)
Income from discontinued operations available to common shareholders	47,005	12,306	62,100	112,348
Discontinued operations
Discontined Operations Income Statement [Line Items]
Capital expenditures	2,100	11,200	3,500	27,400
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	11,318	23,085	25,095	49,702
Operating expenses	(3,452)	(5,253)	(7,787)	(11,952)
Depreciation and amortization	(62)	(3,073)	(2,129)	(8,472)
Impairment charges - real estate assets	(4,018)	0	(14,292)	0
Interest and other income (expense)	(39)	(29)	(60)	(58)
Income taxes	(261)	(30)	(293)	(55)
Loss on debt extinguishment	(7,618)	0	(7,618)	0
Interest expense	(466)	(1,748)	(1,174)	(3,717)
Gain (loss) on property dispositions	52,837	(240)	72,024	89,772
Income from discontinued operations	48,239	12,712	63,766	115,220
Noncontrolling interest - operating partnership	(1,114)	(296)	(1,479)	(2,685)
Noncontrolling interest - consolidated joint ventures	(120)	(110)	(187)	(187)
Income from discontinued operations available to common shareholders	$ 47,005	$ 12,306	$ 62,100	$ 112,348
Properties included in discontinued operations, held for sale
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						14
Properties included in discontinued operations, held for sale \| Southeastern PA
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						2
Properties included in discontinued operations, held for sale \| Chicago/Minneapolis
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						1
Properties included in discontinued operations, held for sale \| Philadelphia
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						8
Properties included in discontinued operations, held for sale \| DC Metro
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						1
Properties included in discontinued operations, held for sale \| United Kingdom
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						2
Properties included in discontinued operations, sold
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						8	37
Properties included in discontinued operations, total
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						59
Properties included in continuing operations, held for sale
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						3
Properties included in continuing operations, sold
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						0	2
Properties included in continuing operations, total
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						5
Properties sold or classified as held for sale, held for sale
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings)					4	17
Acres of Developable Land (in acres) \| a	86.0		86.0
Properties sold or classified as held for sale, sold
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						8	39
Properties sold or classified as held for sale, total
Discontined Operations Income Statement [Line Items]
Number of buildings (in buildings) \| bldg						64