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Business Acquisition (Narrative) (Details) - Navistar, Inc. [Member] ft² in Millions	Feb. 28, 2018 USD ($) ft²
Business Acquisition [Line Items]
Size of facility | ft²	2.2
Number of employees	200
Total consideration	$ 20,225,000
Lease incentive	24,130,000
Closing payments	2,655,000
Deferred rent	24,130,000
Acquisition costs	$ 400,000

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Area of a real estate property.

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

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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