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PARTNERS' EQUITY Table 3 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (96,656)  
Ending balance (94,536)  
Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (42,362) $ (43,772)
Other comprehensive income (loss) before reclassification adjustments 957 (6,828)
Other 0 0
Other comprehensive income (loss) 957 (6,828)
Ending balance (41,405) (50,600)
Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (42,150) (16,124)
Other comprehensive income (loss) before reclassification adjustments 0 (29,830)
Other 0 0
Other comprehensive income (loss) 1,348 (29,183)
Ending balance (40,802) (45,307)
Pension and Other Postretirement Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (12,144) (8,000)
Other comprehensive income (loss) before reclassification adjustments 0 0
Other 2 3
Other comprehensive income (loss) (185) (302)
Ending balance (12,329) (8,302)
Total    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (96,656) (67,896)
Other comprehensive income (loss) before reclassification adjustments 957 (36,658)
Other 2 3
Other comprehensive income (loss) 2,120 (36,313)
Ending balance (94,536) (104,209)
Other income, net | Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI 0 0
Other income, net | Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI 0 0
Other income, net | Pension and Other Postretirement Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI (187) (305)
Other income, net | Total    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI (187) (305)
Interest expense, net | Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI 0 0
Interest expense, net | Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI 1,348 647
Interest expense, net | Pension and Other Postretirement Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI 0 0
Interest expense, net | Total    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net (gain) loss reclassified from AOCI $ 1,348 $ 647