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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,786,757 $ 1,707,161 $ 1,708,026 $ 1,419,675 $ 1,301,309 $ 1,294,144 $ 1,708,026 $ 1,294,144
Balance at beginning of period (in units)     127,195,219       127,195,219  
Comprehensive income (loss):                
Net income 155,351 171,305 $ 192,678 168,072 163,851 38,373 $ 519,334 370,296
Actuarially determined long-term liability adjustments 561 563 565 802 794 790 1,689 2,386
COMPREHENSIVE INCOME 155,912 171,868 193,243 168,874 164,645 39,163 521,023 372,682
Settlement of deferred compensation plans   (1,014) (9,320)          
Purchase of units under unit repurchase program   (1,223) (18,209)          
Common unit-based compensation 3,239 3,121 2,830 2,677 2,340 2,640    
Distributions on deferred common unit-based compensation (1,911) (1,895) (2,901) (1,461) (1,292) (950)    
Distributions from consolidated company to noncontrolling interest (2,081) (2,226) (2,288) (485) (325) (298)    
JC Resources acquisition     (72,250)          
Cash retained by JC Resources in acquisition - See Note 1     (2,933) (3,578) (2,484) (1,590)    
Distributions to Partners (88,988) (89,035) (89,037) (50,877) (44,518) (31,800)    
Balance at end of period $ 1,852,928 1,786,757 1,707,161 1,534,825 1,419,675 1,301,309 $ 1,852,928 1,534,825
Balance at end of period (in units) 127,125,437           127,125,437  
Accumulated Other Comprehensive Income (Loss)                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ (39,926) (40,489) (41,054) (62,645) (63,439) (64,229) $ (41,054) (64,229)
Comprehensive income (loss):                
Actuarially determined long-term liability adjustments 561 563 565 802 794 790    
Balance at end of period (39,365) (39,926) (40,489) (61,843) (62,645) (63,439) (39,365) (61,843)
Noncontrolling Interest                
Increase (decrease) in Partners' Capital                
Balance at beginning of period 25,001 25,712 26,507 11,105 11,107 11,115 26,507 11,115
Comprehensive income (loss):                
Net income 1,652 1,515 1,493 364 323 290    
Distributions from consolidated company to noncontrolling interest (2,081) (2,226) (2,288) (485) (325) (298)    
Balance at end of period 24,572 25,001 25,712 10,984 11,105 11,107 24,572 10,984
Limited Partners' Capital                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,801,682 $ 1,721,938 $ 1,656,025 $ 1,403,733 $ 1,285,725 $ 1,279,183 $ 1,656,025 $ 1,279,183
Balance at beginning of period (in units) 127,125,437 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219
Comprehensive income (loss):                
Net income $ 153,699 $ 169,790 $ 189,801 $ 164,607 $ 161,478 $ 36,652    
Settlement of deferred compensation plans   (1,014) $ (9,320)          
Settlement of deferred compensation plans (in units)     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 3,239 $ 3,121 $ 2,830 2,677 2,340 2,640    
Distributions on deferred common unit-based compensation (1,911) (1,895) (2,901) (1,461) (1,292) (950)    
JC Resources acquisition     (7,251)          
Distributions to Partners (88,988) (89,035) (89,037) (50,877) (44,518) (31,800)    
Balance at end of period $ 1,867,721 $ 1,801,682 $ 1,721,938 $ 1,518,679 $ 1,403,733 $ 1,285,725 $ 1,867,721 $ 1,518,679
Balance at end of period (in units) 127,125,437 127,125,437 127,195,219 127,195,219 127,195,219 127,195,219 127,125,437 127,195,219
General Partners' Capital (Deficit)                
Increase (decrease) in Partners' Capital                
Balance at beginning of period     $ 66,548 $ 67,482 $ 67,916 $ 68,075 $ 66,548 $ 68,075
Comprehensive income (loss):                
Net income     1,384 3,101 2,050 1,431    
JC Resources acquisition     (64,999)          
Cash retained by JC Resources in acquisition - See Note 1     $ (2,933) (3,578) (2,484) (1,590)    
Balance at end of period       $ 67,005 $ 67,482 $ 67,916   $ 67,005