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The Combination Fair Value of Tangible and Identified Intangible Assets and Liabilities (Details) - JBG Companies [Member] $ in Thousands | Jul. 18, 2017 USD ($)
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvements | $ 543,584
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tenant Improvements | 65,572
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 609,156
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Leasehold Improvements | 4,422
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment | 3,468
Business Combination, Recognized Identifiable Assets and Assumed Liabilities, Leasehold Improvements and Equipment | $ 7,890
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years 3 months 18 days
Identified intangible assets | $ 138,371
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities | 8,687
In-place lease amortization (1) |
Finite-lived Intangible Assets Acquired | $ 60,317
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years 4 months 24 days
Above-market real estate lease amortization (2) |
Finite-lived Intangible Assets Acquired | $ 11,732
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years 3 months 18 days
Below-market ground lease amortization (3) |
Finite-lived Intangible Assets Acquired | $ 332
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 88 years 6 months
Option to enter into ground lease amortization (3) |
Finite-lived Intangible Assets Acquired | $ 17,090
Management and leasing contract amortization (1) |
Finite-lived Intangible Assets Acquired | $ 48,900
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 6 months
Minimum | Leasing Arrangement [Member] |
Finite-Lived Intangible Asset, Useful Life | 3 years
Maximum | Leasing Arrangement [Member] |
Finite-Lived Intangible Asset, Useful Life | 9 years
Building and Building Improvements [Member] | Minimum |
Property, Plant and Equipment, Useful Life | 3 years
Building and Building Improvements [Member] | Maximum |
Property, Plant and Equipment, Useful Life | 40 years
Equipment [Member] |
Property, Plant and Equipment, Useful Life | 5 years

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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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