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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,352,193 $ 1,233,393 $ 1,226,069 $ 1,134,520 $ 1,099,906 $ 1,072,267 $ 1,226,069 $ 1,072,267
Balance at beginning of period (in units)     127,195,219       127,195,219  
Comprehensive income (loss):                
Net income 164,971 161,801 $ 36,942 57,724 44,165 24,826 $ 363,714 126,715
Actuarially determined long-term liability adjustments 802 794 790 2,231 2,231 2,231 2,386 6,693
COMPREHENSIVE INCOME 165,773 162,595 37,732 59,955 46,396 27,057 366,100 133,408
Settlement of deferred compensation plans       (1,090)        
Common unit-based compensation 2,677 2,340 2,640 1,746 1,485 723    
Distributions on deferred common unit-based compensation (1,461) (1,292) (950) (323) (324)      
Distributions from consolidated company to noncontrolling interest (485) (325) (298) (252) (222) (141)    
Distributions to Partners (50,877) (44,518) (31,800) (12,718) (12,721)      
Balance at end of period $ 1,467,820 1,352,193 1,233,393 1,181,838 1,134,520 1,099,906 $ 1,467,820 1,181,838
Balance at end of period (in units) 127,195,219           127,195,219  
Accumulated Other Comprehensive Income (Loss)                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ (62,645) (63,439) (64,229) (83,212) (85,443) (87,674) $ (64,229) (87,674)
Comprehensive income (loss):                
Actuarially determined long-term liability adjustments 802 794 790 2,231 2,231 2,231    
Balance at end of period (61,843) (62,645) (63,439) (80,981) (83,212) (85,443) (61,843) (80,981)
Noncontrolling Interest                
Increase (decrease) in Partners' Capital                
Balance at beginning of period 11,105 11,107 11,115 11,221 11,313 11,376 11,115 11,376
Comprehensive income (loss):                
Net income 364 323 290 176 130 78    
Distributions from consolidated company to noncontrolling interest (485) (325) (298) (252) (222) (141)    
Balance at end of period 10,984 11,105 11,107 11,145 11,221 11,313 10,984 11,145
Limited Partners' Capital                
Increase (decrease) in Partners' Capital                
Balance at beginning of period $ 1,403,733 $ 1,285,725 $ 1,279,183 $ 1,206,511 $ 1,174,036 $ 1,148,565 $ 1,279,183 $ 1,148,565
Balance at beginning of period (in units) 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219
Comprehensive income (loss):                
Net income $ 164,607 $ 161,478 $ 36,652 $ 57,548 $ 44,035 $ 24,748    
Settlement of deferred compensation plans       (1,090)        
Common unit-based compensation 2,677 2,340 2,640 1,746 1,485 723    
Distributions on deferred common unit-based compensation (1,461) (1,292) (950) (323) (324)      
Distributions to Partners (50,877) (44,518) (31,800) (12,718) (12,721)      
Balance at end of period $ 1,518,679 $ 1,403,733 $ 1,285,725 $ 1,251,674 $ 1,206,511 $ 1,174,036 $ 1,518,679 $ 1,251,674
Balance at end of period (in units) 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219 127,195,219