Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE DISCLOSURES (Details)

v3.24.3
FAIR VALUE DISCLOSURES (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Feb. 28, 2021
6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 6.875%    
IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs $ 1,600    
Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 6.875%   6.875%
Unamortized debt issuance costs $ 4,700 $ 5,800  
Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs 9,800 8,400  
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 629,066 548,070  
Carrying Amount | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 395,251 394,184  
Carrying Amount | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 184,014 153,886  
Carrying Amount | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 49,801    
Level 1 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 0  
Level 1 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 0  
Level 1 | Fair Value | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 0  
Level 1 | Fair Value | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0    
Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 636,939 545,535  
Level 2 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 394,794 383,068  
Level 2 | Fair Value | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 190,947 162,467  
Level 2 | Fair Value | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 51,198    
Level 3 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 0  
Level 3 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 0  
Level 3 | Fair Value | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0 $ 0  
Level 3 | Fair Value | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 0