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PARTNERS' EQUITY Table 7 - Balance of and Changes in Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 $ (84,927)
Other comprehensive income (loss) 18,303
Balance as of June 30, 2018 (66,624)
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 (6,379)
Other comprehensive income (loss) (6,319)
Balance as of June 30, 2018 (57,922)
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 22,527
Other comprehensive income (loss) 25,079
Balance as of June 30, 2018 775
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 comprehensive income (loss) (457)
Balance as of June 30, 2018 (9,477)
Total  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance as of January 1, 2018 (84,927)
Other comprehensive income (loss) before reclassification adjustments 16,148
Other comprehensive income (loss) 18,303
Balance as of June 30, 2018 (66,624)
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 60
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 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 (407)
Other (50)
Other income, net | Total  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Reclassification from accumulated other comprehensive income, current period, net of tax (407)
Other 10
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 2,552
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 $ 2,552