Real Estate (Significant Acquisition) (Details) - Fairfax Junction $ in Millions	Feb. 08, 2019 USD ($) ft²
Significant Acquisition
Square footage of real estate property \| ft²	75,000
Purchase price of real estate acquisition	$ 22.5
Other Liabilities
Significant Acquisition
Below Market Lease, Acquired	0.4
Amortization of above market leases \| Other Assets
Significant Acquisition
Finite-lived Intangible Assets Acquired	$ 0.6

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration