Long-Term Debt (Credit Facility) (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Aug. 03, 2018
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity	$ 110,000,000.0
Percentage of maximum secured borrowing capacity	12.50%
Payments of notes payable	$ 0
Net deferred financing fees	1,264,000	$ 1,376,000
Amortization of deferred financing costs	$ 100,000
PNC Bank [Member]
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio			110.00%
Amended and Restated Prior Credit Agreement [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Debt instrument, expiration date	Aug. 03, 2023
Revolving Credit Facility [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Commitment fee on the daily unused portion of the Revolver	0.25%
Net deferred financing fees	$ 600,000
Revolving Credit Facility [Member] | PNC Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate	1.93%
Revolving Credit Facility [Member] | Amended and Restated Prior Credit Agreement [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity			$ 110,000,000.0
Term Loan [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Frequency of Periodic Payment	quarterly
Quarterly term loan payments	$ 400,000
Term Loan [Member] | PNC Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate	2.43%
Term Loan [Member] | Amended and Restated Prior Credit Agreement [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity			$ 10,000,000.0