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Long-Term Debt Schedule of Long-Term Debt (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 2,211,165,000 $ 2,187,289,000
Less: Unamortized Debt Issuance Costs 15,252,000 17,536,000
Less: Amounts Due in One Year 0 263,000
Long-Term Debt 2,211,165,000 2,187,026,000
Current portion of capital lease obligation 6,891,000 6,848,000
Senior Notes Due April 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount 1,314,307,000 1,705,682,000
Debt Instrument, Unamortized Premium 2,573,000 3,544,000
Long-term Debt, Gross 1,316,880,000 1,709,226,000
Senior Notes due April 2023 [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount 500,000,000 500,000,000
Debt Instrument, Unamortized Discount 4,525,000 4,751,000
Long-term Debt, Gross 495,475,000 495,249,000
Senior Notes due March 2026 [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount 400,000,000  
Debt Instrument, Unamortized Discount 5,938,000  
Long-term Debt, Gross 394,062,000 0
Revolving Credit Facility - CNXM [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 20,000,000 0
Other Note Maturing in 2018 [Member]    
Debt Instrument [Line Items]    
Debt instrument, face amount   358,000
Debt Instrument, Unamortized Discount   8,000
Long-term Debt, Gross $ 0 $ 350,000