Investments in Real Estate (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Land	$ 356,704	$ 87,610
Buildings and Improvements	54,008	276,913
Tenant Improvements	0	1,582
Below-Market Leases	(200,113)	(249,465)
Acquisition Date Fair Value	410,712	415,764
Acquired above-market leases
Business Acquisition [Line Items]
Intangibles	$ 0	$ 21,043
Weighted average remaining intangible amortization life (in months)	2 years 10 months 1 day	65 months
Acquired in-place lease value
Business Acquisition [Line Items]
Intangibles	$ 0	$ 30,111
Weighted average remaining intangible amortization life (in months)	6 years 4 months 10 days	81 months
Acquired below-market leases
Business Acquisition [Line Items]
Below-Market Leases	$ 0	$ (1,495)
Weighted average remaining intangible amortization life (in months)		80 months
Land Parcels
Business Acquisition [Line Items]
Land	296,071	$ 55,229
Buildings and Improvements	0	0
Tenant Improvements	0	0
Acquisition Date Fair Value	296,071	55,229
Land Parcels \| Acquired above-market leases
Business Acquisition [Line Items]
Intangibles	0	0
Land Parcels \| Acquired in-place lease value
Business Acquisition [Line Items]
Intangibles	0	0
Land Parcels \| Acquired below-market leases
Business Acquisition [Line Items]
Below-Market Leases	0	0
Data Centers
Business Acquisition [Line Items]
Land	60,633	20,431
Buildings and Improvements	54,008	275,374
Tenant Improvements	0	1,506
Acquisition Date Fair Value	114,641	346,199
Data Centers \| Acquired above-market leases
Business Acquisition [Line Items]
Intangibles	0	21,043
Data Centers \| Acquired in-place lease value
Business Acquisition [Line Items]
Intangibles	0	28,656
Data Centers \| Acquired below-market leases
Business Acquisition [Line Items]
Below-Market Leases	$ 0	(811)
Technology Manufacturing
Business Acquisition [Line Items]
Land		11,950
Buildings and Improvements		1,539
Tenant Improvements		76
Acquisition Date Fair Value		14,336
Technology Manufacturing \| Acquired above-market leases
Business Acquisition [Line Items]
Intangibles		0
Technology Manufacturing \| Acquired in-place lease value
Business Acquisition [Line Items]
Intangibles		1,455
Technology Manufacturing \| Acquired below-market leases
Business Acquisition [Line Items]
Below-Market Leases		$ (684)

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvement

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tenant Improvements

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

Amount of real estate acquired, at the acquisition date.

+ References

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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