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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Payments of Debt Issuance Costs $ 250    
Capital Lease Obligations, Current 10,191   $ 10,323
Debt Instrument, Repurchased Face Amount 99,956    
Long-term debt (2,622,358)   (2,724,672)
Unamortized Debt Issuance Expense 25,499   27,699
Long-term Line of Credit, Noncurrent 197,000    
Long-Term Debt 2,620,698   2,722,995
Long Term Debt, Current Maturities - Net of unamortized debt issuance costs 1,660   1,677
Gains (Losses) on Extinguishment of Debt $ 822 $ 0  
Senior notes due April 2020 at 8.25%      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.375%    
Long-term debt $ (74,470)   (74,470)
Senior notes due March 2021 at 6.375%      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.875%    
Long-term debt $ (20,611)   (20,611)
Senior Secured Notes Due March 2021 Par Value [Member] [Member] [Member]      
Debt Instrument [Line Items]      
Long-term debt (1,754,310)   (1,854,731)
Senior Notes due April 2023 at 8.0% [Member]      
Debt Instrument [Line Items]      
Long-term debt (494,570)   (494,344)
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75%      
Debt Instrument [Line Items]      
Long-term debt (102,865)   (102,865)
Advance royalty commitments      
Debt Instrument [Line Items]      
Long-term debt (2,678)   (2,678)
Other long-term notes maturing at various dates through 2031      
Debt Instrument [Line Items]      
Long-term debt $ (1,353)   (1,672)
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term debt     $ (201,000)