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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (Decrease) in Partners's Capital    
Balance at beginning of period $ 1,072,267 $ 1,265,424
Balance at beginning of period (in units) 127,195,219  
Comprehensive income (loss):    
Net income (loss) $ 24,826 (144,707)
Actuarially determined long-term liability adjustments 2,231 938
COMPREHENSIVE INCOME (LOSS) 27,057 (143,769)
Settlement of deferred compensation plans   (1,310)
Common unit-based compensation 723 (527)
Distributions on deferred common unit-based compensation   (986)
Distributions from consolidated company to noncontrolling interest (141) (288)
Distributions to Partners   (50,767)
Other   (273)
Balance at end of period $ 1,099,906 1,067,504
Balance at end of period (in units) 127,195,219  
Accumulated Other Comprehensive Income (Loss)    
Increase (Decrease) in Partners's Capital    
Balance at beginning of period $ (87,674) (77,993)
Comprehensive income (loss):    
Actuarially determined long-term liability adjustments 2,231 938
Balance at end of period (85,443) (77,055)
Noncontrolling Interest    
Increase (Decrease) in Partners's Capital    
Balance at beginning of period 11,376 11,935
Comprehensive income (loss):    
Net income (loss) 78 76
Distributions from consolidated company to noncontrolling interest (141) (288)
Balance at end of period 11,313 11,723
Limited Partners' Capital    
Increase (Decrease) in Partners's Capital    
Balance at beginning of period $ 1,148,565 $ 1,331,482
Balance at beginning of period (in units) 127,195,219 126,915,597
Comprehensive income (loss):    
Net income (loss) $ 24,748 $ (144,783)
Settlement of deferred compensation plans   $ (1,310)
Settlement of deferred compensation plans (in units)   279,622
Common unit-based compensation 723 $ (527)
Distributions on deferred common unit-based compensation   (986)
Distributions to Partners   (50,767)
Other   (273)
Balance at end of period $ 1,174,036 $ 1,132,836
Balance at end of period (in units) 127,195,219 127,195,219