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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,707,161 $ 1,708,026 $ 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 171,305 $ 192,678 163,851 38,373 $ 363,983 202,224
Actuarially determined long-term liability adjustments 563 565 794 790 1,128 1,584
COMPREHENSIVE INCOME 171,868 193,243 164,645 39,163 365,111 203,808
Settlement of deferred compensation plans (1,014) (9,320)        
Purchase of units under unit repurchase program (1,223) (18,209)        
Common unit-based compensation 3,121 2,830 2,340 2,640    
Distributions on deferred common unit-based compensation (1,895) (2,901) (1,292) (950)    
Distributions from consolidated company to noncontrolling interest (2,226) (2,288) (325) (298)    
Distributions to Partners (89,035) (89,037) (44,518) (31,800)    
JC Resources acquisition   (72,250)        
Cash retained by JC Resources in acquisition   (2,933) (2,484) (1,590)    
Balance at end of period $ 1,786,757 1,707,161 1,419,675 1,301,309 $ 1,786,757 1,419,675
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 $ (40,489) (41,054) (63,439) (64,229) $ (41,054) (64,229)
Comprehensive income (loss):            
Actuarially determined long-term liability adjustments 563 565 794 790    
Balance at end of period (39,926) (40,489) (62,645) (63,439) (39,926) (62,645)
Noncontrolling Interest            
Increase (decrease) in Partners' Capital            
Balance at beginning of period 25,712 26,507 11,107 11,115 26,507 11,115
Comprehensive income (loss):            
Net income 1,515 1,493 323 290    
Distributions from consolidated company to noncontrolling interest (2,226) (2,288) (325) (298)    
Balance at end of period 25,001 25,712 11,105 11,107 25,001 11,105
Limited Partners' Capital            
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,721,938 $ 1,656,025 $ 1,285,725 $ 1,279,183 $ 1,656,025 $ 1,279,183
Balance at beginning of period (in units) 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219
Comprehensive income (loss):            
Net income $ 169,790 $ 189,801 $ 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 $ 3,121 $ 2,830 2,340 2,640    
Distributions on deferred common unit-based compensation (1,895) (2,901) (1,292) (950)    
Distributions to Partners (89,035) (89,037) (44,518) (31,800)    
JC Resources acquisition   (7,251)        
Balance at end of period $ 1,801,682 $ 1,721,938 $ 1,403,733 $ 1,285,725 $ 1,801,682 $ 1,403,733
Balance at end of period (in units) 127,125,437 127,195,219 127,195,219 127,195,219 127,125,437 127,195,219
General Partners' Capital (Deficit)            
Increase (decrease) in Partners' Capital            
Balance at beginning of period   $ 66,548 $ 67,916 $ 68,075 $ 66,548 $ 68,075
Comprehensive income (loss):            
Net income   1,384 2,050 1,431    
JC Resources acquisition   (64,999)        
Cash retained by JC Resources in acquisition   $ (2,933) (2,484) (1,590)    
Balance at end of period     $ 67,482 $ 67,916   $ 67,482