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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Partners's Capital            
Balance at beginning of period $ 1,099,906 $ 1,072,267 $ 1,067,504 $ 1,265,424 $ 1,072,267 $ 1,265,424
Balance at beginning of period (in units)   127,195,219     127,195,219  
Comprehensive income (loss):            
Net income (loss) 44,165 $ 24,826 (46,679) (144,707) $ 68,991 (191,386)
Actuarially determined long-term liability adjustments 2,231 2,231 939 938 4,462 1,877
COMPREHENSIVE INCOME (LOSS) 46,396 27,057 (45,740) (143,769) 73,453 (189,509)
Settlement of deferred compensation plans       (1,310)    
Common unit-based compensation 1,485 723 1,610 (527)    
Distributions on deferred common unit-based compensation (324)     (986)    
Distributions from consolidated company to noncontrolling interest (222) (141) (222) (288)    
Distributions to Partners (12,721)     (50,767)    
Other       (273)    
Balance at end of period $ 1,134,520 1,099,906 1,023,152 1,067,504 $ 1,134,520 1,023,152
Balance at end of period (in units) 127,195,219       127,195,219  
Accumulated Other Comprehensive Income (Loss)            
Increase (Decrease) in Partners's Capital            
Balance at beginning of period $ (85,443) (87,674) (77,055) (77,993) $ (87,674) (77,993)
Comprehensive income (loss):            
Actuarially determined long-term liability adjustments 2,231 2,231 939 938    
Balance at end of period (83,212) (85,443) (76,116) (77,055) (83,212) (76,116)
Noncontrolling Interest            
Increase (Decrease) in Partners's Capital            
Balance at beginning of period 11,313 11,376 11,723 11,935 11,376 11,935
Comprehensive income (loss):            
Net income (loss) 130 78 (15) 76    
Distributions from consolidated company to noncontrolling interest (222) (141) (222) (288)    
Balance at end of period 11,221 11,313 11,486 11,723 11,221 11,486
Limited Partners' Capital            
Increase (Decrease) in Partners's Capital            
Balance at beginning of period $ 1,174,036 $ 1,148,565 $ 1,132,836 $ 1,331,482 $ 1,148,565 $ 1,331,482
Balance at beginning of period (in units) 127,195,219 127,195,219 127,195,219 126,915,597 127,195,219 126,915,597
Comprehensive income (loss):            
Net income (loss) $ 44,035 $ 24,748 $ (46,664) $ (144,783)    
Settlement of deferred compensation plans       $ (1,310)    
Settlement of deferred compensation plans (in units)       279,622    
Common unit-based compensation 1,485 723 1,610 $ (527)    
Distributions on deferred common unit-based compensation (324)     (986)    
Distributions to Partners (12,721)     (50,767)    
Other       (273)    
Balance at end of period $ 1,206,511 $ 1,174,036 $ 1,087,782 $ 1,132,836 $ 1,206,511 $ 1,087,782
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