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Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($)
Dec. 31, 2018
Aug. 31, 2018
Jan. 31, 2018
Dec. 31, 2017
May 31, 2016
Apr. 30, 2014
Feb. 28, 2013
Feb. 28, 2011
Debt Instrument [Line Items]                
Senior Secured Bank Credit Agreement $ 0     $ 475,000,000        
Pipeline financings 180,073,000     192,429,000        
Capital lease obligations 5,362,000     26,298,000        
Total debt principal balance 2,532,207,000     2,775,391,000        
Future interest payable 250,218,000 [1]     316,818,000        
Debt issuance costs (13,089,000)     (7,935,000)        
Total debt, net of debt issuance costs 2,769,336,000     3,084,274,000        
Less: current maturities of long-term debt (105,125,000) [1]     (105,188,000)        
Long-term Debt and Capital Lease Obligations 2,664,211,000     2,979,086,000        
9% Senior Secured Second Lien Notes due 2021                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount         $ 614,900,000      
Long-term Debt, Gross $ 614,919,000     614,919,000        
Debt Instrument, Interest Rate, Stated Percentage 9.00%              
9 1/4% Senior Secured Second Lien Notes due 2022                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount     $ 74,100,000 381,568,000        
Long-term Debt, Gross $ 455,668,000     381,568,000        
Debt Instrument, Interest Rate, Stated Percentage 9.25%              
7 1/2% Senior Secured Second Lien Notes due 2024                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount   $ 450,000,000.0            
Long-term Debt, Gross $ 450,000,000     0        
Debt Instrument, Interest Rate, Stated Percentage 7.50%              
3 1/2% Convertible Senior Notes due 2024                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount       84,650,000        
Long-term Debt, Gross $ 0     84,650,000        
Debt Instrument, Interest Rate, Stated Percentage 3.50%              
6 3/8% Senior Subordinated Notes due 2021                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount               $ 400,000,000
Long-term Debt, Gross $ 203,545,000     215,144,000        
Debt Instrument, Interest Rate, Stated Percentage 6.375%              
5 1/2% Senior Subordinated Notes due 2022                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount           $ 1,250,000,000.00    
Long-term Debt, Gross $ 314,662,000     408,882,000        
Debt Instrument, Interest Rate, Stated Percentage 5.50%              
4 5/8% Senior Subordinated Notes due 2023                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount             $ 1,200,000,000.0  
Long-term Debt, Gross $ 307,978,000     376,501,000        
Debt Instrument, Interest Rate, Stated Percentage 4.625%              
5% Convertible Senior Notes due 2023                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount     $ 59,400,000          
Future interest payable on senior secured and convertible senior notes                
Debt Instrument [Line Items]                
Less: current maturities of long-term debt $ (85,303,000)     (75,347,000)        
Long-term Debt and Capital Lease Obligations $ 164,914,000     $ 241,472,000        
[1] Future interest payable represents most of the interest due over the term of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”), 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”) and to a small extent our previously outstanding 3½% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors. Our current maturities of long-term debt as of December 31, 2018 include $85.3 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months. See January 2018 Senior Subordinated Note Exchanges and 2017 Senior Subordinated Note Exchanges below for further discussion.