Long-Term Debt (Credit Facility) (Narrative) (Details) - USD ($)		9 Months Ended
	Oct. 23, 2017	Sep. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Deferred financing fees		$ 813,000	$ 1,005,000
Amortization of deferred financing costs		$ 200,000
PNC Bank [Member]
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio		1.10%
PNC Bank [Member] | New Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt instrument, maturity date		Jan. 21, 2021
Revolving Credit Facility [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity		$ 65,000,000
Commitment fee on the daily unused portion of the Revolver		0.25%
Revolving Credit Facility [Member] | PNC Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate		3.99%
Revolving Credit Facility [Member] | PNC Bank [Member] | Request to Increase Borrowing Prior to January 21, 2020 [Member]
Line of Credit Facility [Line Items]
Increase in maximum aggregate principal amount of borrowings		$ 25,000,000
Letter of Credit [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity		10,000,000
Term Loan [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity		30,000,000
Quarterly term loan payments		$ 1,100,000
Term Loan [Member] | PNC Bank [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate		4.49%
Swing Loan Credit Facility [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity		$ 6,500,000
Senior Bank Borrowings [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Percentage of interest rates decrease in bank borrowings	0.75%
Reduction in annual interest expense	$ 400,000