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PARTNERS' EQUITY Table 6 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 $ (84,927)
Other comprehensive income (loss) 23,204
Balance as of September 30, 2018 (61,723)
Foreign Currency Translation  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 (51,603)
Other comprehensive income (loss) before reclassification adjustments (6,536)
Other 60
Other comprehensive income (loss) (6,476)
Balance as of September 30, 2018 (58,079)
Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 (24,304)
Other comprehensive income (loss) before reclassification adjustments 26,067
Other 0
Other comprehensive income (loss) 30,338
Balance as of September 30, 2018 6,034
Pension and Other Postretirement Benefits  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 (9,020)
Other comprehensive income (loss) before reclassification adjustments 0
Other (47)
Other comprehensive income (loss) (658)
Balance as of September 30, 2018 (9,678)
Total  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 (84,927)
Other comprehensive income (loss) before reclassification adjustments 19,531
Other 13
Other comprehensive income (loss) 23,204
Balance as of September 30, 2018 (61,723)
Other income, net | Foreign Currency Translation  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax 0
Other income, net | Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax 0
Other income, net | Pension and Other Postretirement Benefits  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax (611)
Other income, net | Total  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax (611)
Interest expense, net | Foreign Currency Translation  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax 0
Interest expense, net | Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax 4,271
Interest expense, net | Pension and Other Postretirement Benefits  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax 0
Interest expense, net | Total  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax $ 4,271