PARTNERS' EQUITY (Tables)
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12 Months Ended |
Dec. 31, 2020 |
| Distribution Made to Limited Partner [Line Items] |
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| Schedule of Preferred Units [Table Text Block] |
The following is a summary of our Series A, Series B and Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (collectively the Series A, B and C Preferred Units) issued and outstanding as of December 31, 2020: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Units | | Original Issuance Date | | Number of Units Issued and Outstanding | | Price per Unit | | Fixed Distribution Rate per Annum (as a Percentage of the $25.00 Liquidation Preference per Unit) | | Fixed Distribution Rate per Unit per Annum | | Fixed Distribution per Annum (in thousands) | | Optional Redemption Date/Date at Which Distribution Rate Becomes Floating | | Floating Annual Rate (as a Percentage of the $25.00 Liquidation Preference per Unit) | Series A Preferred Units | | November 25, 2016 | | 9,060,000 | | $ | 25.00 | | | 8.50 | % | | $ | 2.125 | | | $ | 19,252 | | | December 15, 2021 | | Three-month LIBOR plus 6.766% | Series B Preferred Units | | April 28, 2017 | | 15,400,000 | | $ | 25.00 | | | 7.625 | % | | $ | 1.90625 | | | $ | 29,357 | | | June 15, 2022 | | Three-month LIBOR plus 5.643% | Series C Preferred Units | | November 30, 2017 | | 6,900,000 | | $ | 25.00 | | | 9.00 | % | | $ | 2.25 | | | $ | 15,525 | | | December 15, 2022 | | Three-month LIBOR plus 6.88% |
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| Schedule of Common Units [Table Text Block] |
The following table shows the balance of and changes in the number of our common units outstanding: | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | 2020 | | 2019 | | 2018 | | Balance as of the beginning of year | 108,527,806 | | | 107,225,156 | | | 93,176,683 | | | Issuance of units | — | | | 527,426 | | | 413,736 | | Unit-based compensation (refer to Note 23 for discussion) | 940,321 | | | 775,224 | | | 225,144 | | Merger (refer to Note 5 for discussion) | — | | | — | | | 13,409,593 | | | Balance as of the end of year | 109,468,127 | | | 108,527,806 | | | 107,225,156 | |
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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, 2018 | $ | (51,603) | | | $ | (24,304) | | | $ | (9,020) | | | $ | (84,927) | | Other comprehensive (loss) income before reclassification adjustments | (13,880) | | | 17,912 | | | 3,282 | | | 7,314 | | Sale of European Operations reclassified into other income, net | 18,124 | | | — | | | — | | | 18,124 | | Net gain on pension costs reclassified into other income, net | — | | | — | | | (814) | | | (814) | | | Net loss on cash flow hedges reclassified into interest expense, net | — | | | 5,499 | | | — | | | 5,499 | | Other | 60 | | | — | | | (134) | | | (74) | | | Other comprehensive income | 4,304 | | | 23,411 | | | 2,334 | | | 30,049 | | | Balance as of December 31, 2018 | (47,299) | | | (893) | | | (6,686) | | | (54,878) | | Other comprehensive income (loss) before reclassification adjustments | 3,527 | | | (19,045) | | | 1,000 | | | (14,518) | | Net gain on pension costs reclassified into other income, net | — | | | — | | | (2,314) | | | (2,314) | | | Net loss on cash flow hedges reclassified into interest expense, net | — | | | 3,814 | | | — | | | 3,814 | | | | | | | | | | | Other comprehensive income (loss) | 3,527 | | | (15,231) | | | (1,314) | | | (13,018) | | | Balance as of December 31, 2019 | (43,772) | | | (16,124) | | | (8,000) | | | (67,896) | | Other comprehensive income (loss) before reclassification adjustments | 1,410 | | | (30,291) | | | (2,924) | | | (31,805) | | Net gain on pension costs reclassified into other income, net | — | | | — | | | (1,220) | | | (1,220) | | Net loss on cash flow hedges reclassified into interest expense, net | — | | | 4,265 | | | — | | | 4,265 | | | | | | | | | | | Other comprehensive income (loss) | 1,410 | | | (26,026) | | | (4,144) | | | (28,760) | | | Balance as of December 31, 2020 | $ | (42,362) | | | $ | (42,150) | | | $ | (12,144) | | | $ | (96,656) | |
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| Common Limited Partner [Member] |
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| Distribution Made to Limited Partner [Line Items] |
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| Distributions Made to Limited Partner, by Distribution [Table Text Block] |
The following table summarizes information about cash distributions to our common limited partners applicable to the period in which the distributions were earned: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cash Distributions Per Unit | | Total Cash Distributions | | Record Date | | Payment Date | | | | | (Thousands of Dollars) | | | | | | Quarter ended: | | | | | | | | | | December 31, 2020 | | $ | 0.40 | | | $ | 43,787 | | | February 8, 2021 | | February 12, 2021 | | September 30, 2020 | | 0.40 | | | 43,678 | | | November 6, 2020 | | November 13, 2020 | | June 30, 2020 | | 0.40 | | | 43,678 | | | August 7, 2020 | | August 13, 2020 | | March 31, 2020 | | 0.40 | | | 43,730 | | | May 11, 2020 | | May 15, 2020 | | Year ended December 31, 2020 | | $ | 1.60 | | | $ | 174,873 | | | | | | | | | | | | | | | | Year ended December 31, 2019 | | $ | 2.40 | | | $ | 259,136 | | | | | | | Year ended December 31, 2018 | | $ | 2.40 | | | $ | 248,705 | | | | | |
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