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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total $ 365,432 $ 367,227
Less: Short-term Debt (8,852)  
Long-term debt 356,580 362,455
Senior Notes [Member]    
Debt Instrument [Line Items]    
Total 274,132 267,827
Other Debt [Member]    
Debt Instrument [Line Items]    
Total 569 1,400
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving Facility $ 90,731 $ 98,000