Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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The current amount of expenditures for a real estate project that has not yet been completed.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Investments in Real Estate (Schedule of Real Estate Property Acquisitions) (Details) $ in Thousands, € in Millions					12 Months Ended
	Aug. 01, 2016 USD ($)	Aug. 01, 2016 EUR (€)	Jul. 05, 2016 USD ($) property	Oct. 09, 2015 USD ($)	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	Sep. 30, 2016 property
Real Estate Properties [Line Items]
Land					$ 746,822	$ 689,573
Acquired Ground Lease					11,335	12,639
Building and Improvements					10,267,525	9,676,427
Tenant Improvements					532,787	536,734
Accumulated Depreciation and Amortization					(2,668,509)	(2,251,268)
Net investments in properties					8,889,960	8,664,105
Direct and accrued costs related to work in progress					$ 900,000	700,000
Purchase price						95,200
Number of real estate properties \| property					145
Consideration transferred				$ 1,886,000
Land Parcels
Real Estate Properties [Line Items]
Purchase price					$ 47,600
Number of real estate properties \| property							4
Europe Portfolio Acquisition and Land Parcels
Real Estate Properties [Line Items]
Purchase price					866,500
Europe Portfolio Acquisition
Real Estate Properties [Line Items]
Number of real estate properties \| property			8
Consideration transferred	$ 212,000	€ 190	$ 818,900
Internet Gateway Data Centers
Real Estate Properties [Line Items]
Land					109,714	109,389
Acquired Ground Lease					0	0
Building and Improvements					1,924,869	1,440,594
Tenant Improvements					93,472	95,185
Accumulated Depreciation and Amortization					(675,725)	(607,452)
Net investments in properties					1,452,330	1,037,716
Data Centers
Real Estate Properties [Line Items]
Land					598,475	539,298
Acquired Ground Lease					10,014	11,317
Building and Improvements					8,052,356	7,438,334
Tenant Improvements					431,444	433,679
Accumulated Depreciation and Amortization					(1,924,694)	(1,575,589)
Net investments in properties					7,167,595	6,847,039
Technology Manufacturing
Real Estate Properties [Line Items]
Land					20,199	20,199
Acquired Ground Lease					1,321	1,322
Building and Improvements					57,766	56,254
Tenant Improvements					6,333	6,333
Accumulated Depreciation and Amortization					(24,595)	(22,677)
Net investments in properties					61,024	61,431
Technology Office
Real Estate Properties [Line Items]
Land					12,398	12,142
Acquired Ground Lease					0	0
Building and Improvements					73,650	49,470
Tenant Improvements					1,460	1,459
Accumulated Depreciation and Amortization					(21,407)	(18,564)
Net investments in properties					66,101	44,507
Other
Real Estate Properties [Line Items]
Land					6,036	8,545
Acquired Ground Lease					0	0
Building and Improvements					158,884	691,775
Tenant Improvements					78	78
Accumulated Depreciation and Amortization					(22,088)	(26,986)
Net investments in properties					$ 142,910	$ 673,412