Long-Term Debt (Credit Facility) (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Deferred financing fees	$ 941,000	$ 1,005,000
Amortization of deferred financing costs	$ 100,000
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	3.79%
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	4.29%
Swing Loan Credit Facility [Member] | PNC Bank [Member]
Line of Credit Facility [Line Items]
Maximum secured borrowing capacity	$ 6,500,000