Debt And Interest Rate Swap Contracts (Schedule Of Long-Term Debt Outstanding) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 24,361,000	$ 25,294,000
Less: Current portion	(3,731,000)	(3,731,000)
Long-term debt, net of current portion	20,630,000	21,563,000
Revolving Line Of Credit, Maturing November 12, 2016 [Member]
Debt Instrument [Line Items]
Term loan, maturity date	Nov. 12, 2016
Term Loan, Maturing November 12, 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	2,040,000	2,080,000
Quarterly principal amount	40,000	40,000
Term loan, maturity date	Nov. 12, 2016
Term Loan, Maturing June 30, 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	22,321,000	23,214,000
Quarterly principal amount	$ 900,000
Term loan, maturity date	Jun. 30, 2020