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PARTNERS' CAPITAL - Change (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Increase (decrease) in Partners' Capital    
Balance at beginning of period $ 1,226,069 $ 1,072,267
Balance at beginning of period (in units) 127,195,219  
Comprehensive income (loss):    
Net income (loss) $ 36,942 24,826
Actuarially determined long-term liability adjustments 790 2,231
COMPREHENSIVE INCOME 37,732 27,057
Common unit-based compensation 2,640 723
Distributions on deferred common unit-based compensation (950)  
Distributions from consolidated company to noncontrolling interest (298) (141)
Distributions to Partners (31,800)  
Balance at end of period $ 1,233,393 1,099,906
Balance at end of period (in units) 127,195,219  
Accumulated Other Comprehensive Income (Loss)    
Increase (decrease) in Partners' Capital    
Balance at beginning of period $ (64,229) (87,674)
Comprehensive income (loss):    
Actuarially determined long-term liability adjustments 790 2,231
Balance at end of period (63,439) (85,443)
Noncontrolling Interest    
Increase (decrease) in Partners' Capital    
Balance at beginning of period 11,115 11,376
Comprehensive income (loss):    
Net income (loss) 290 78
Distributions from consolidated company to noncontrolling interest (298) (141)
Balance at end of period 11,107 11,313
Limited Partners' Capital    
Increase (decrease) in Partners' Capital    
Balance at beginning of period $ 1,279,183 $ 1,148,565
Balance at beginning of period (in units) 127,195,219 127,195,219
Comprehensive income (loss):    
Net income (loss) $ 36,652 $ 24,748
Common unit-based compensation 2,640 723
Distributions on deferred common unit-based compensation (950)  
Distributions to Partners (31,800)  
Balance at end of period $ 1,285,725 $ 1,174,036
Balance at end of period (in units) 127,195,219 127,195,219