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Long-term Debt (Schedule Of Line Of Credit Facilities) (Details) - USD ($)
$ in Thousands
Jun. 05, 2015
Sep. 30, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Amounts borrowed   $ 79,600 $ 79,600
Amounts available to borrow [1]   67,450 42,218
Increase option $ 100,000    
Letter Of Credit [Member]      
Line of Credit Facility [Line Items]      
Outstanding letters of credit   $ 2,950 $ 3,182
[1] Excluding $100 million increase option