PARTNERS' EQUITY (Tables)
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6 Months Ended |
Jun. 30, 2016 |
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| Partners' Capital Notes [Abstract] |
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| Schedule of Changes in Partners' Equity |
The following table summarizes changes to our partners’ equity (in thousands of dollars): | | | | | Balance as of January 1, 2016 | $ | 1,609,844 |
| Net income | 109,918 |
| Unit-based compensation expense | 4,352 |
| Other comprehensive loss | (38,117 | ) | Cash distributions to partners | (196,102 | ) | Balance as of June 30, 2016 | $ | 1,489,895 |
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| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
The balance of and changes in the components included in AOCI were as follows: | | | | | | | | | | | | | | | | | | Foreign Currency Translation | | Cash Flow Hedges | | Pension and Other Postretirement Benefits | | Total | | (Thousands of Dollars) | Balance as of January 1, 2016 | $ | (60,826 | ) | | $ | (27,968 | ) | | $ | — |
| | $ | (88,794 | ) | Other comprehensive income (loss): | | | | | | | | Employee Transfer | — |
| | — |
| | 4,201 |
| | 4,201 |
| Deferred income tax adjustments | — |
| | — |
| | 2,414 |
| | 2,414 |
| Other comprehensive income (loss) before reclassification adjustments | 1,711 |
| | (50,178 | ) | | — |
| | (48,467 | ) | Net gain on pension costs reclassified into operating expense | — |
| | — |
| | (479 | ) | | (479 | ) | Net gain on pension costs reclassified into general and administrative expense | — |
| | — |
| | (166 | ) | | (166 | ) | Net loss on cash flow hedges reclassified into interest expense, net | — |
| | 4,380 |
| | — |
| | 4,380 |
| Other comprehensive income (loss) | 1,711 |
| | (45,798 | ) | | 5,970 |
| | (38,117 | ) | Balance as of June 30, 2016 | $ | (59,115 | ) | | $ | (73,766 | ) | | $ | 5,970 |
| | $ | (126,911 | ) |
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| Schedule of Calculation of Net Income Applicable to General Partner [Text Block] |
The following table details the calculation of net income applicable to the general partner: | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2016 | | 2015 | | 2016 | | 2015 | | (Thousands of Dollars) | Net income applicable to general partner and limited partners’ interest | $ | 52,517 |
| | $ | 54,325 |
| | $ | 109,918 |
| | $ | 182,224 |
| Less general partner incentive distribution | 10,805 |
| | 10,805 |
| | 21,610 |
| | 21,610 |
| Net income after general partner incentive distribution | 41,712 |
| | 43,520 |
| | 88,308 |
| | 160,614 |
| General partner interest | 2 | % | | 2 | % | | 2 | % | | 2 | % | General partner allocation of net income after general partner incentive distribution | 834 |
| | 871 |
| | 1,766 |
| | 3,213 |
| General partner incentive distribution | 10,805 |
| | 10,805 |
| | 21,610 |
| | 21,610 |
| Net income applicable to general partner | $ | 11,639 |
| | $ | 11,676 |
| | $ | 23,376 |
| | $ | 24,823 |
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| Schedule of Distributions To General and Limited Partners [Text Block] |
The following table reflects the allocation of total cash distributions to the general and limited partners applicable to the period in which the distributions were earned: | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2016 | | 2015 | | 2016 | | 2015 | | (Thousands of Dollars, Except Per Unit Data) | General partner interest | $ | 1,961 |
| | $ | 1,961 |
| | $ | 3,922 |
| | $ | 3,922 |
| General partner incentive distribution | 10,805 |
| | 10,805 |
| | 21,610 |
| | 21,610 |
| Total general partner distribution | 12,766 |
| | 12,766 |
| | 25,532 |
| | 25,532 |
| Limited partners’ distribution | 85,285 |
| | 85,285 |
| | 170,570 |
| | 170,570 |
| Total cash distributions | $ | 98,051 |
| | $ | 98,051 |
| | $ | 196,102 |
| | $ | 196,102 |
| | | | | | | | | Cash distributions per unit applicable to limited partners | $ | 1.095 |
| | $ | 1.095 |
| | $ | 2.190 |
| | $ | 2.190 |
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| Distributions Made to Limited and General Partners, by Distribution [Table Text Block] |
The following table summarizes information related to our quarterly cash distributions: | | | | | | | | | | | | | | Quarter Ended | | Cash Distributions Per Unit | | Total Cash Distributions | | Record Date | | Payment Date | | | | | (Thousands of Dollars) | | | | | June 30, 2016 (a) | | $ | 1.095 |
| | $ | 98,051 |
| | August 9, 2016 | | August 12, 2016 | March 31, 2016 | | $ | 1.095 |
| | $ | 98,051 |
| | May 9, 2016 | | May 13, 2016 | December 31, 2015 | | $ | 1.095 |
| | $ | 98,051 |
| | February 8, 2016 | | February 12, 2016 |
| | (a) | The distribution was announced on July 29, 2016. |
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