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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt $ 349,335 $ 341,615
Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt 300,000 300,000
Other Debt    
Debt Instrument [Line Items]    
Long-term Debt 1,335 1,615
Revolving Facility    
Debt Instrument [Line Items]    
Revolving Facility $ 48,000 $ 40,000