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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of company's assets and liabilities that are measured at fair value on a recurring basis
The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020, for each fair value hierarchy level: 
 Fair Value Measurements Using:
 Quoted Prices in   
 Active Markets forSignificant OtherSignificant 
 Identical AssetsObservable InputsUnobservable Inputs 
 (Level 1)(Level 2)(Level 3)Total
 (In thousands)
September 30, 2021    
Assets:    
Commodity derivatives $— $— $— $— 
Provisional oil sales— — — — 
Liabilities:
Commodity derivatives — (129,411)— (129,411)
Total $— $(129,411)$— $(129,411)
December 31, 2020
Assets:
Commodity derivatives $— $16,378 $— $16,378 
Provisional oil sales— (677)— (677)
Liabilities:
Commodity derivatives — (36,078)— (36,078)
Total $— $(20,377)$— $(20,377)
Schedule of carrying values and fair values of financial instruments that are not carried at fair value
The following table presents the carrying values and fair values at September 30, 2021 and December 31, 2020:
 
 September 30, 2021December 31, 2020
 Carrying ValueFair ValueCarrying ValueFair Value
 (In thousands)
7.125% Senior Notes
$644,302 $637,728 $643,524 $613,412 
7.500% Senior Notes
444,732 436,905 — — 
GoM Term Loan200,000 200,000 200,000 200,000 
Corporate Revolver— — 100,000 100,000 
Facility1,150,000 1,150,000 1,200,000 1,200,000 
Total$2,439,034 $2,424,633 $2,143,524 $2,113,412