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SHORT-TERM AND LONG-TERM DEBT - Components (Details) - USD ($)
Dec. 31, 2023
Mar. 31, 2023
Feb. 28, 2023
Dec. 31, 2022
Debt Instrument [Line Items]        
Total debt $ 1,826,504,000     $ 1,732,679,000
Current portion of debt (106,135,000)     (99,706,000)
Long-term portion of debt issuance costs (12,096,000)     (13,749,000)
Long-term debt 1,708,273,000     1,619,224,000
U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Total debt 1,280,623,000     1,329,878,000
U.S. dollar denominated floating rate debt | Flex Amber Sale and Leaseback        
Debt Instrument [Line Items]        
Total debt 0     139,022,000
U.S. dollar denominated floating rate debt | $320 Million Sale and Leaseback        
Debt Instrument [Line Items]        
Gross price 320,000,000      
Total debt 287,275,000     305,974,000
U.S. dollar denominated floating rate debt | $330 Million Sale and Leaseback        
Debt Instrument [Line Items]        
Gross price 330,000,000   $ 330,000,000  
Total debt 313,000,000     0
U.S. dollar denominated floating rate debt | Flex Rainbow $180 Million Sale and Leaseback        
Debt Instrument [Line Items]        
Gross price   $ 180,000,000    
Total debt 174,066,000     0
U.S. dollar denominated fixed rate debt        
Debt Instrument [Line Items]        
Total debt 145,881,000     152,801,000
U.S. dollar denominated fixed rate debt | Flex Volunteer Sale and Leaseback        
Debt Instrument [Line Items]        
Total debt 145,881,000     152,801,000
U.S. dollar denominated revolving credit facilities        
Debt Instrument [Line Items]        
Total debt 400,000,000     250,000,000
$629 Million Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   629,000,000 $ 629,000,000  
$629 Million Facility | U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity 629,000,000      
Total debt 0     467,865,000
$125 million term tranche under the $375 Million Facility | U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Face amount       125,000,000
Total debt 97,354,000     119,475,000
$375 million revolving credit facility | U.S. dollar denominated revolving credit facilities        
Debt Instrument [Line Items]        
Maximum borrowing capacity 375,000,000      
Flex Enterprise $150 Million Facility | U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity 150,000,000      
Total debt 137,718,000     147,542,000
Flex Resolute $150 Million Facility | U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Maximum borrowing capacity 150,000,000      
Total debt 142,106,000     150,000,000
$140 million term tranche under the $290 Million Facility | U.S. dollar denominated floating rate debt        
Debt Instrument [Line Items]        
Face amount   140,000,000    
Total debt 129,104,000     0
$290 million facility | U.S. dollar denominated revolving credit facilities        
Debt Instrument [Line Items]        
Maximum borrowing capacity 290,000,000 290,000,000    
$250 million revolving tranche under the $375 Million Facility | U.S. dollar denominated revolving credit facilities        
Debt Instrument [Line Items]        
Face amount       250,000,000
Total debt 250,000,000     250,000,000
$150 million revolving tranche under the $290 Million Facility | U.S. dollar denominated revolving credit facilities        
Debt Instrument [Line Items]        
Face amount   $ 150,000,000    
Total debt $ 150,000,000     $ 0