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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 211,558  
Total long-term debt 211,558 $ 196,470
Line of Credit Due Two Thousand Eightteen [Member]    
Debt Instrument [Line Items]    
Total debt $ 27,108 0
Debt instrument maturity, year 2018  
5.75% Senior Unsecured Notes Due 2018    
Debt Instrument [Line Items]    
Total debt $ 184,450 $ 196,470
Debt instrument maturity, year 2018  
Debt instrument, interest rate 5.75%