Subsequent Events (Narrative) (Details) - USD ($)				9 Months Ended	12 Months Ended
	Oct. 12, 2018	Oct. 11, 2018	Oct. 01, 2018	Sep. 30, 2018	Dec. 31, 2017	Oct. 31, 2018
Subsequent Event [Line Items]
Loan amount				$ 268,176,000	$ 271,732,000
Cotter, Jr. Related Litigation Matters [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Incurred expenses exceeding insurance limit			$ 1,500,000
Trust Preferred Securities [Member]
Subsequent Event [Line Items]
Loan amount				$ 27,913,000	$ 27,913,000
Maturity date				Apr. 30, 2027	Apr. 30, 2027
Trust Preferred Securities [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Loan amount		$ 1,600,000
Initial payment						$ 1,100,000
Contractual obligation due in October 2021		270,000
Contractual obligation due in October 2025		$ 225,000
Minetta And Orpheum Theatres Loan [Member]
Subsequent Event [Line Items]
Loan amount				$ 7,500,000	$ 7,500,000
Maturity date				Nov. 01, 2023	Jun. 01, 2018
Santander Bank [Member] | Minetta And Orpheum Theatres Loan [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Loan amount	$ 8,000,000