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Long-Term Debt And Credit Facilities (Revolving Line Of Credit) (Narrative) (Details) - Revolving Credit Facility [Member]
12 Months Ended
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]  
Line of credit maturity date Mar. 31, 2018
Minimum tangible net worth requirement $ (22,500,000)
Line of credit facility, amount outstanding 0
Line of credit facility, current borrowing capacity $ 5,200,000
Minimum [Member]  
Line of Credit Facility [Line Items]  
Liquidity ratio 1.50