v3.25.2
SHORT TERM AND LONG-TERM DEBT - Short Term and Long-Term Debt Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total debt $ 1,814,461 $ 1,823,322
Current portion of debt (108,267) (108,906)
Long-term portion of debt issuance costs (9,916) (10,887)
Long-term debt 1,696,278 1,703,529
Floating rate long-term debt    
Debt Instrument [Line Items]    
Total debt 1,265,813 1,270,991
Floating rate long-term debt | $90 million term tranche under the $270 Million Facility    
Debt Instrument [Line Items]    
Total debt 81,828 90,000
Face amount 90,000  
Floating rate long-term debt | Flex Resolute $150 Million Facility    
Debt Instrument [Line Items]    
Total debt 130,264 134,211
Line of credit facility, maximum borrowing capacity 150,000  
Floating rate long-term debt | Flex Enterprise $150 Million Facility    
Debt Instrument [Line Items]    
Total debt 39,304 44,217
Line of credit facility, maximum borrowing capacity 150,000  
Floating rate long-term debt | $140 million term tranche under the $290 Million Facility    
Debt Instrument [Line Items]    
Total debt 107,317 114,579
Face amount 140,000  
Floating rate long-term debt | Flex Courageous $175 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Gross price 175,000  
Total debt 175,000 0
Floating rate long-term debt | Flex Endeavour $160 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Gross price 160,000  
Total debt 154,345 158,190
Floating rate long-term debt | $320 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Gross price 320,000  
Total debt 129,613 268,576
Floating rate long-term debt | Flex Rainbow $180 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Gross price 180,000  
Total debt 160,642 165,218
Floating rate long-term debt | $330 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Gross price 330,000  
Total debt 287,500 296,000
Line of credit    
Debt Instrument [Line Items]    
Total debt 413,675 413,675
Line of credit | $270 Million Facility    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 270,000  
Line of credit | Flex Enterprise $150 Million Facility    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 150,000  
Line of credit | $290 Million Facility    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 290,000  
Line of credit | $84 million revolving tranche under the Flex Enterprise $150 Million Facility    
Debt Instrument [Line Items]    
Total debt 83,675 83,675
Face amount 84,000  
Line of credit | $150 million revolving tranche under the $290 Million Facility    
Debt Instrument [Line Items]    
Total debt 150,000 150,000
Face amount 150,000  
Line of credit | $180 million term tranche under the $270 Million Facility    
Debt Instrument [Line Items]    
Total debt 180,000 180,000
Face amount 180,000  
Line of credit | $320 Million Sale and Leaseback    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 320,000  
Fixed rate long-term debt    
Debt Instrument [Line Items]    
Total debt 134,973 138,656
Fixed rate long-term debt | Flex Volunteer Sale and Leaseback    
Debt Instrument [Line Items]    
Total debt $ 134,973 $ 138,656