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Financial Commitments (Long-Term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 825,733 $ 817,684
Less - current maturities (99,970) (88,917)
Long-term debt, net 725,763 728,767
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Total debt $ 297,366 297,118
Imputed interest rate 7.99%  
Original Revolver [Member]    
Debt Instrument [Line Items]    
Total debt $ 178,738 155,815
Imputed interest rate 8.84%  
Term Loan [Member]    
Debt Instrument [Line Items]    
Total debt $ 220,198 222,120
Equipment Financing, Mortgages And Acquisition-related Notes [Member]    
Debt Instrument [Line Items]    
Total debt 124,911 133,288
Other Indebtedness    
Debt Instrument [Line Items]    
Total debt $ 4,520 $ 9,343