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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Revolving Credit Facility | Unsecured Debt
Loss Contingencies
Letters of credit outstanding	$ 2.5
Geographic Concentration Risk | California
Loss Contingencies
Contribution risk, percentage	90.00%
Customer Concentration Risk | Rentable Square Feet
Loss Contingencies
Contribution risk, percentage	29.00%
Customer Concentration Risk | Rentable Square Feet | Media And Entertainment Sector
Loss Contingencies
Contribution risk, percentage	16.00%
Customer Concentration Risk | Rentable Square Feet | Technology Sector
Loss Contingencies
Contribution risk, percentage	34.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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