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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,921,404 $ 1,858,597 $ 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 101,509 $ 159,567 171,305 192,678 $ 261,076 363,983
Actuarially determined long-term liability adjustments 957 923 563 565 1,880 1,128
COMPREHENSIVE INCOME 102,466 160,490 171,868 193,243 262,956 365,111
Settlement of deferred compensation plans   (13,292) (1,014) (9,320)    
Purchase of units under unit repurchase program     (1,223) (18,209)    
Common unit-based compensation 2,926 2,604 3,121 2,830    
Distributions on deferred common unit-based compensation (1,091) (2,261) (1,895) (2,901)    
Distributions from consolidated company to noncontrolling interest (1,942) (1,981) (2,226) (2,288)    
JC Resources acquisition       (72,250)    
Cash retained by JC Resources in acquisition       (2,933)    
Distributions to Partners (89,645) (88,985) (89,035) (89,037)    
Balance at end of period $ 1,934,118 1,921,404 1,786,757 1,707,161 $ 1,934,118 1,786,757
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 $ (60,602) (61,525) (40,489) (41,054) (61,525) (41,054)
Comprehensive income (loss):            
Actuarially determined long-term liability adjustments 957 923 563 565    
Balance at end of period (59,645) (60,602) (39,926) (40,489) (59,645) (39,926)
Noncontrolling Interest            
Increase (decrease) in Partners' Capital            
Balance at beginning of period 23,624 24,095 25,712 26,507 24,095 26,507
Comprehensive income (loss):            
Net income 1,322 1,510 1,515 1,493    
Distributions from consolidated company to noncontrolling interest (1,942) (1,981) (2,226) (2,288)    
Balance at end of period 23,004 23,624 25,001 25,712 23,004 25,001
Limited Partners' Capital            
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,958,382 $ 1,896,027 $ 1,721,938 $ 1,656,025 $ 1,896,027 $ 1,656,025
Balance at beginning of period (in units) 128,061,981 127,125,437 127,195,219 127,195,219 127,125,437 127,195,219
Comprehensive income (loss):            
Net income $ 100,187 $ 158,057 $ 169,790 $ 189,801    
Settlement of deferred compensation plans   $ (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 2,926 $ 2,604 $ 3,121 $ 2,830    
Distributions on deferred common unit-based compensation (1,091) (2,261) (1,895) (2,901)    
JC Resources acquisition       (7,251)    
Distributions to Partners (89,645) (88,985) (89,035) (89,037)    
Balance at end of period $ 1,970,759 $ 1,958,382 $ 1,801,682 $ 1,721,938 $ 1,970,759 $ 1,801,682
Balance at end of period (in units) 128,061,981 128,061,981 127,125,437 127,195,219 128,061,981 127,125,437
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)