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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 20, 2018
Sep. 12, 2016
Aug. 12, 2016
May 21, 2015
Nov. 17, 2014
May 20, 2013
Assets:                  
Derivative Assets, Fair Value, Gross Asset $ 75,808 $ 233,629              
Liabilities:                  
Derivative Liability, Fair Value, Gross Liability (54,290) (75,349)              
Oil and Gas Properties                  
Impairment of proved properties 0 0 $ 3,800            
Abandonment and impairment of unproved properties 33,800 49,900 12,300            
Impairment of oil and gas properties $ 33,842 49,889 $ 16,078            
6.125% Senior Notes Due 2022 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 6.125%                
Debt Instrument, Face Amount $ 476,796 476,796           $ 600,000  
Long-term Debt, Fair Value $ 481,564 452,336              
5% Senior Notes Due 2024 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 5.00%                
Debt Instrument, Face Amount $ 500,000 500,000             $ 500,000
Long-term Debt, Fair Value $ 479,815 439,265              
5.625% Senior Notes Due 2025 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 5.625%                
Debt Instrument, Face Amount $ 500,000 500,000         $ 500,000    
Long-term Debt, Fair Value $ 475,835 436,460              
6.75% Senior Notes Due 2026 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 6.75%                
Debt Instrument, Face Amount $ 500,000 500,000     $ 500,000        
Long-term Debt, Fair Value $ 494,860 448,305              
6.625% Senior Notes Due 2027 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 6.625%                
Debt Instrument, Face Amount $ 500,000 500,000   $ 500,000          
Long-term Debt, Fair Value $ 493,750 442,500              
1.50% Senior Convertible Notes Due 2021 [Member]                  
Debt Instrument, Fair Value Disclosure [Abstract]                  
Senior Notes, interest rate, stated percentage 1.50%                
Debt Instrument, Face Amount $ 172,500 172,500       $ 172,500      
Long-term Debt, Fair Value 164,430 158,614              
Proved Properties [Member]                  
Oil and Gas Properties                  
Proved and unproved oil and gas properties recorded at fair value 0 0              
Unproved Properties [Member]                  
Oil and Gas Properties                  
Proved and unproved oil and gas properties recorded at fair value 0 0              
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]                  
Assets:                  
Derivative Assets, Fair Value, Gross Asset 0 [1] 0 [2]              
Liabilities:                  
Derivative Liability, Fair Value, Gross Liability 0 [1] 0 [2]              
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]                  
Assets:                  
Derivative Assets, Fair Value, Gross Asset 75,808 [1] 233,629 [2]              
Liabilities:                  
Derivative Liability, Fair Value, Gross Liability 54,290 [1] 75,349 [2]              
Not Designated as Hedging Instrument [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]                  
Assets:                  
Derivative Assets, Fair Value, Gross Asset 0 [1] 0 [2]              
Liabilities:                  
Derivative Liability, Fair Value, Gross Liability $ 0 [1] $ 0 [2]              
[1]
(1) 
This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2]
(1) 
This represents a financial asset or liability that is measured at fair value on a recurring basis.