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OPERATING LEASES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Lessor, Lease, Description [Line Items]      
Vessels leased to third parties, cost $ 196,000 $ 196,000  
Vessels leased to third parties, accumulated depreciation 152,300 72,800  
Operating lease, ROU asset 5,653 10,293  
Operating lease, liability, payments, due $ 5,148 $ 7,900  
Weighted average remaining lease term 4 years 9 months 18 days 5 years  
Weighted average discount rate, percent 5.50% 5.50%  
Total operating revenues $ 267,740 $ 260,273 $ 261,388
Administrative (income)/expenses 38,100 35,311 34,376
Contract assets 21,297 21,778  
Sub-lease agreement      
Lessor, Lease, Description [Line Items]      
Administrative (income)/expenses 4    
Sub-lease agreement | Minimum      
Lessor, Lease, Description [Line Items]      
Contract assets 100    
Vessel management fees and other revenues      
Lessor, Lease, Description [Line Items]      
Total operating revenues 44,085 $ 27,777 $ 20,695
Vessel management fees and other revenues | Sub-lease agreement      
Lessor, Lease, Description [Line Items]      
Total operating revenues $ 400