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Debt And Liquidity (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total Debt $ 333,712 $ 365,432
Less: Short-term Debt (13,282) (8,852)
Long-term debt 320,430 356,580
Senior Notes    
Debt Instrument [Line Items]    
Total Debt 278,959 274,132
Other Debt    
Debt Instrument [Line Items]    
Total Debt 677 569
Credit Facility (Revolving Facility and Term Loan Facility)    
Debt Instrument [Line Items]    
Credit Facility (Revolving Facility and Term Loan Facility) $ 54,076 $ 90,731