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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 21, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 12, 2016
May 21, 2015
Nov. 17, 2014
May 20, 2013
Jun. 29, 2012
Nov. 08, 2011
Proved Oil and Gas Properties                    
Impairment of proved properties   $ 3,806 $ 354,614 $ 468,679            
Abandonment and impairment of unproved properties   12,272 80,367 78,643            
Impairment of other property and equipment   $ 0 0 $ 49,369            
6.50% Senior Notes Due 2021 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.50%                
Senior Notes, face amount     346,955             $ 350,000
6.125% Senior Notes Due 2022 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.125%                
Senior Notes, face amount     561,796       $ 600,000      
6.50% Senior Notes Due 2023 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.50%                
Senior Notes, face amount     394,985           $ 400,000  
5% Senior Notes Due 2024 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   5.00%                
Senior Notes, face amount     500,000         $ 500,000    
5.625% Senior Notes Due 2025 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   5.625%                
Senior Notes, face amount     500,000     $ 500,000        
6.75% Senior Notes Due 2026 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.75%                
Senior Notes, face amount     500,000   $ 500,000          
Oil and Gas Properties [Member]                    
Proved Oil and Gas Properties                    
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast   5 years                
Minimum [Member] | Oil and Gas Properties [Member]                    
Proved Oil and Gas Properties                    
Fair Value Inputs, Discount Rate   10.00%                
Maximum [Member] | Oil and Gas Properties [Member]                    
Proved Oil and Gas Properties                    
Fair Value Inputs, Discount Rate   15.00%                
Senior Notes [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, face amount   $ 2,801,392 2,803,736              
Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.50%                
Senior Notes, face amount   $ 344,611 346,955              
Long-term Debt, Fair Value   $ 351,682 354,546              
Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.125%                
Senior Notes, face amount   $ 561,796 561,796              
Long-term Debt, Fair Value   $ 571,627 570,925              
Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.50%                
Senior Notes, face amount   $ 394,985 394,985              
Long-term Debt, Fair Value   $ 403,434 403,134              
Senior Notes [Member] | 5% Senior Notes Due 2024 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   5.00%                
Senior Notes, face amount   $ 500,000 500,000              
Long-term Debt, Fair Value   $ 483,440 475,975              
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   5.625%                
Senior Notes, face amount   $ 500,000 500,000              
Long-term Debt, Fair Value   $ 494,355 485,000              
Senior Notes [Member] | 6.75% Senior Notes Due 2026 [Member]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   6.75%                
Senior Notes, face amount   $ 500,000 500,000              
Long-term Debt, Fair Value   $ 516,350 516,565              
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Domain]                    
Debt Instrument, Fair Value Disclosure [Abstract]                    
Senior Notes, interest rate, stated percentage   1.50%                
Senior Notes, face amount   $ 172,500 172,500              
Long-term Debt, Fair Value   $ 168,291 $ 202,189              
QStar Acquisition 2016 [Member]                    
Proved Oil and Gas Properties                    
Private issuance of Common Stock for an acquisition 13.4