Annual report [Section 13 and 15(d), not S-K Item 405]

FAIR VALUE DISCLOSURES - Fair Value of Debt (Details)

v3.25.0.1
FAIR VALUE DISCLOSURES - Fair Value of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs $ (16,300)    
Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 6.875% 6.875% 6.875%
Unamortized debt issuance costs $ (4,400) $ (5,800)  
Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs (9,100) (8,400)  
Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs (2,800)    
Carrying Amount      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 689,783 548,070  
Carrying Amount | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 395,610 394,184  
Carrying Amount | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 200,273 153,886  
Carrying Amount | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 93,900    
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 699,329 545,535  
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 397,872 383,068  
Level 2 | Fair Value | Secured Debt | UKSAR Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 205,545 162,467  
Level 2 | Fair Value | Secured Debt | IRCG Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 95,912    
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