Investments in Real Estate (Schedule of Real Estate Property Acquisitions) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Land	$ 1,509,764	$ 1,136,341
Acquired Ground Lease	10,575	11,150
Building and Improvements	16,745,210	15,215,405
Tenant Improvements	574,336	553,040
Accumulated Depreciation and Amortization	(3,935,267)	(3,238,227)
Net investments in properties	14,904,618	13,677,709
Direct and accrued costs related to work in progress	1,600,000	1,400,000
Internet Gateway Data Centers
Real Estate Properties [Line Items]
Land	101,964	109,844
Acquired Ground Lease	0	0
Building and Improvements	2,137,458	1,940,495
Tenant Improvements	114,013	99,174
Accumulated Depreciation and Amortization	(885,315)	(778,659)
Net investments in properties	1,468,120	1,370,854
Data Centers
Real Estate Properties [Line Items]
Land	1,391,585	1,010,306
Acquired Ground Lease	10,575	11,150
Building and Improvements	14,502,437	13,147,042
Tenant Improvements	460,247	453,712
Accumulated Depreciation and Amortization	(3,016,646)	(2,430,984)
Net investments in properties	13,348,198	12,191,226
Technology Manufacturing
Real Estate Properties [Line Items]
Land	11,959	11,959
Acquired Ground Lease	0	0
Building and Improvements	1,582	1,564
Tenant Improvements	76	76
Accumulated Depreciation and Amortization	(100)	(31)
Net investments in properties	13,517	13,568
Technology Office
Real Estate Properties [Line Items]
Land	2,091	2,067
Acquired Ground Lease	0	0
Building and Improvements	23,104	23,029
Tenant Improvements	0	0
Accumulated Depreciation and Amortization	(18,441)	(16,779)
Net investments in properties	6,754	8,317
Other
Real Estate Properties [Line Items]
Land	2,165	2,165
Acquired Ground Lease	0	0
Building and Improvements	80,629	103,275
Tenant Improvements		78
Accumulated Depreciation and Amortization	(14,765)	(11,774)
Net investments in properties	$ 68,029	$ 93,744