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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,934,118 $ 1,921,404 $ 1,858,597 $ 1,786,757 $ 1,707,161 $ 1,708,026 $ 1,858,597 $ 1,708,026
Balance at beginning of period (in units)     127,125,437       127,125,437  
Comprehensive income (loss):                
Net income 86,916 101,509 $ 159,567 155,351 171,305 192,678 $ 347,992 519,334
Actuarially determined long-term liability adjustments 1,022 957 923 561 563 565 2,902 1,689
COMPREHENSIVE INCOME 87,938 102,466 160,490 155,912 171,868 193,243 350,894 521,023
Settlement of deferred compensation plans (2,252)   (13,292)   (1,014) (9,320)    
Purchase of units under unit repurchase program         (1,223) (18,209)    
Common unit-based compensation 3,032 2,926 2,604 3,239 3,121 2,830    
Distributions on deferred common unit-based compensation (1,082) (1,091) (2,261) (1,911) (1,895) (2,901)    
Distributions from consolidated company to noncontrolling interest (1,883) (1,942) (1,981) (2,081) (2,226) (2,288)    
JC Resources acquisition           (72,250)    
Cash retained by JC Resources in acquisition           (2,933)    
Other (5,118)              
Distributions to Partners (89,643) (89,645) (88,985) (88,988) (89,035) (89,037)    
Balance at end of period $ 1,925,110 1,934,118 1,921,404 1,852,928 1,786,757 1,707,161 $ 1,925,110 1,852,928
Balance at end of period (in units) 128,061,981           128,061,981  
Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period     6,232       $ 6,232  
Accumulated Other Comprehensive Income (Loss)                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ (59,645) (60,602) (61,525) (39,926) (40,489) (41,054) (61,525) (41,054)
Comprehensive income (loss):                
Actuarially determined long-term liability adjustments 1,022 957 923 561 563 565    
Balance at end of period (58,623) (59,645) (60,602) (39,365) (39,926) (40,489) (58,623) (39,365)
Noncontrolling Interest                
Increase (decrease) in Partners' Capital                
Balance at beginning of period 23,004 23,624 24,095 25,001 25,712 26,507 24,095 26,507
Comprehensive income (loss):                
Net income 635 1,322 1,510 1,652 1,515 1,493    
Distributions from consolidated company to noncontrolling interest (1,883) (1,942) (1,981) (2,081) (2,226) (2,288)    
Balance at end of period 21,756 23,004 23,624 24,572 25,001 25,712 21,756 24,572
Limited Partners' Capital                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,970,759 $ 1,958,382 $ 1,896,027 $ 1,801,682 $ 1,721,938 $ 1,656,025 $ 1,896,027 $ 1,656,025
Balance at beginning of period (in units) 128,061,981 128,061,981 127,125,437 127,125,437 127,195,219 127,195,219 127,125,437 127,195,219
Comprehensive income (loss):                
Net income $ 86,281 $ 100,187 $ 158,057 $ 153,699 $ 169,790 $ 189,801    
Settlement of deferred compensation plans (2,252)   $ (13,292)   (1,014) $ (9,320)    
Settlement of deferred common unit- based compensation plans (in units)     936,544     860,060    
Purchase of units under unit repurchase program         $ (1,223) $ (18,209)    
Purchase of units under unit repurchase program (in units)         (69,782) (860,060)    
Common unit-based compensation 3,032 2,926 $ 2,604 3,239 $ 3,121 $ 2,830    
Distributions on deferred common unit-based compensation (1,082) (1,091) (2,261) (1,911) (1,895) (2,901)    
JC Resources acquisition           (7,251)    
Other (5,118)              
Distributions to Partners (89,643) (89,645) (88,985) (88,988) (89,035) (89,037)    
Balance at end of period $ 1,961,977 $ 1,970,759 $ 1,958,382 $ 1,867,721 $ 1,801,682 $ 1,721,938 $ 1,961,977 $ 1,867,721
Balance at end of period (in units) 128,061,981 128,061,981 128,061,981 127,125,437 127,125,437 127,195,219 128,061,981 127,125,437
Limited Partners' Capital | Cumulative Effect, Period of Adoption, Adjustment                
Increase (decrease) in Partners' Capital                
Balance at beginning of period     $ 6,232       $ 6,232  
General Partners' Capital                
Increase (decrease) in Partners' Capital                
Balance at beginning of period           $ 66,548   $ 66,548
Comprehensive income (loss):                
Net income           1,384    
JC Resources acquisition           (64,999)    
Cash retained by JC Resources in acquisition           $ (2,933)