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Revenue - Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenues $ 1,220,374 $ 1,464,975 $ 1,190,184
Revenue 1,220,374 1,464,975 1,190,184
Time charters      
Disaggregation of Revenue [Line Items]      
Revenue 25,915 31,149 14,738
Voyage charters      
Disaggregation of Revenue [Line Items]      
Revenue 1,066,963 1,321,487 1,039,262
FPSO      
Disaggregation of Revenue [Line Items]      
Revenue     27,064
Management fees and other      
Disaggregation of Revenue [Line Items]      
Revenues 127,496 112,339 109,120
Revenue $ 127,496 $ 112,339 $ 109,120
Lease revenue [Member]      
Disaggregation of Revenue [Line Items]      
Operating Leases, Income Statement, Lease Revenue Revenue Revenue Revenue
Operating Lease, Variable Lease Income $ 409 $ 0 $ 18,326
Lease income 1,092,878 1,352,636 1,081,064
Operating Segments | Tankers [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 1,106,278 1,364,452 1,063,111
Operating Segments | Tankers [Member] | Time charters      
Disaggregation of Revenue [Line Items]      
Revenue 24,773 31,149 14,738
Operating Segments | Tankers [Member] | Voyage charters      
Disaggregation of Revenue [Line Items]      
Revenue 1,066,963 1,321,487 1,039,262
Operating Segments | Tankers [Member] | FPSO      
Disaggregation of Revenue [Line Items]      
Revenue     0
Operating Segments | Tankers [Member] | Management fees and other      
Disaggregation of Revenue [Line Items]      
Revenue 14,542 11,816 9,111
Operating Segments | Marine Services and Other      
Disaggregation of Revenue [Line Items]      
Revenue 114,096 100,523 127,073
Operating Segments | Marine Services and Other | Time charters      
Disaggregation of Revenue [Line Items]      
Revenue 1,142 0 0
Operating Segments | Marine Services and Other | Voyage charters      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Operating Segments | Marine Services and Other | FPSO      
Disaggregation of Revenue [Line Items]      
Revenue     27,064
Operating Segments | Marine Services and Other | Management fees and other      
Disaggregation of Revenue [Line Items]      
Revenue $ 112,954 $ 100,523 $ 100,009