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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,233,393 $ 1,226,069 $ 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 161,801 $ 36,942 44,165 24,826 $ 198,743 68,991
Actuarially determined long-term liability adjustments 794 790 2,231 2,231 1,584 4,462
COMPREHENSIVE INCOME 162,595 37,732 46,396 27,057 200,327 73,453
Common unit-based compensation 2,340 2,640 1,485 723    
Distributions on deferred common unit-based compensation (1,292) (950) (324)      
Distributions from consolidated company to noncontrolling interest (325) (298) (222) (141)    
Distributions to Partners (44,518) (31,800) (12,721)      
Balance at end of period $ 1,352,193 1,233,393 1,134,520 1,099,906 $ 1,352,193 1,134,520
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 $ (63,439) (64,229) (85,443) (87,674) $ (64,229) (87,674)
Comprehensive income (loss):            
Actuarially determined long-term liability adjustments 794 790 2,231 2,231    
Balance at end of period (62,645) (63,439) (83,212) (85,443) (62,645) (83,212)
Noncontrolling Interest            
Increase (decrease) in Partners' Capital            
Balance at beginning of period 11,107 11,115 11,313 11,376 11,115 11,376
Comprehensive income (loss):            
Net income 323 290 130 78    
Distributions from consolidated company to noncontrolling interest (325) (298) (222) (141)    
Balance at end of period 11,105 11,107 11,221 11,313 11,105 11,221
Limited Partners' Capital            
Increase (decrease) in Partners' Capital            
Balance at beginning of period $ 1,285,725 $ 1,279,183 $ 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
Comprehensive income (loss):            
Net income $ 161,478 $ 36,652 $ 44,035 $ 24,748    
Common unit-based compensation 2,340 2,640 1,485 723    
Distributions on deferred common unit-based compensation (1,292) (950) (324)      
Distributions to Partners (44,518) (31,800) (12,721)      
Balance at end of period $ 1,403,733 $ 1,285,725 $ 1,206,511 $ 1,174,036 $ 1,403,733 $ 1,206,511
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