Properties And Equipment (Narrative) (Details)	1 Months Ended		3 Months Ended
	Jun. 30, 2023 USD ($) a ft²	May 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 a
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property			$ 4,100,000	$ 4,600,000
Disposal Group, Not Discontinued Operations [Member] | 2483 Trenton Avenue Williamsport Pennsylvania [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a	26.6
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2483 Trenton Avenue Williamsport Pennsylvania [Member]
Property, Plant and Equipment [Line Items]
Book value	$ 460,000
Area of Land | a					26.6
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2483 Trenton Avenue Williamsport Pennsylvania [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Area of Land | ft²	18,000
Property book value adjustment	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Culver City Los Angeles [Member]
Property, Plant and Equipment [Line Items]
Sale price		$ 8,300,000
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Culver City Los Angeles [Member]
Property, Plant and Equipment [Line Items]
Adjustment to sale price		0
Book value		$ 10,800,000