Quarterly report pursuant to Section 13 or 15(d)

FRESH START ACCOUNTING (Reorganization Adjustment to Common Stock, Additional Paid in Capital and Common Stock Held in Reserve) (Details)

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FRESH START ACCOUNTING (Reorganization Adjustment to Common Stock, Additional Paid in Capital and Common Stock Held in Reserve) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
May 17, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Common stock $ 2 $ 2 $ 1,607
Additional paid-in capital 692,182 693,774 $ 4,213,752
New Common Stock held in reserve $ (30,216) (54,109)  
Issuance of common stock to settle General Unsecured Claims against Gulfport Parent      
Reorganization, Chapter 11 [Line Items]      
Common stock   0  
Additional paid-in capital   27,751  
Issuance of common stock to settle General Unsecured Claims against Gulfport Subsidiaries      
Reorganization, Chapter 11 [Line Items]      
Common stock   2  
Additional paid-in capital   666,022  
Common stock reserved for settlement of claims post Emergence Date (par value)      
Reorganization, Chapter 11 [Line Items]      
Common stock   0  
Net change to New Common Stock      
Reorganization, Chapter 11 [Line Items]      
Common stock   2  
Extinguishment of Predecessor stock-based compensation      
Reorganization, Chapter 11 [Line Items]      
Additional paid-in capital   4,419  
Extinguishment of Predecessor paid in capital      
Reorganization, Chapter 11 [Line Items]      
Additional paid-in capital   (4,220,256)  
Shares held in reserve to settle Allowed Claims against Gulfport Parent      
Reorganization, Chapter 11 [Line Items]      
New Common Stock held in reserve   (23,894)  
Shares held in reserve to settle Allowed Claims against Gulfport Subsidiary      
Reorganization, Chapter 11 [Line Items]      
New Common Stock held in reserve   (30,215)  
Reorganization Adjustments      
Reorganization, Chapter 11 [Line Items]      
Common stock   (1,609)  
Additional paid-in capital   (3,522,064)  
New Common Stock held in reserve   $ (54,109)