| Schedule of Net (Loss) Income Per Unit [Text Block] |
The following table details the calculation of net loss per common unit: | | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | | 2020 | | 2019 | | 2018 | | | (Thousands of Dollars, Except Unit and Per Unit Data) | | Net (loss) income | $ | (198,983) | | | $ | (105,693) | | | $ | 205,794 | | | Distributions to preferred limited partners | (124,882) | | | (121,693) | | | (92,540) | | | Distributions to general partner | — | | | — | | | (1,141) | | | Distributions to common limited partners | (174,873) | | | (259,136) | | | (248,705) | | | Distribution equivalent rights to restricted units | (2,093) | | | (2,659) | | | (2,045) | | | Distributions in excess of (loss) income | $ | (500,831) | | | $ | (489,181) | | | $ | (138,637) | | | | | | | | | Distributions to common limited partners | $ | 174,873 | | | $ | 259,136 | | | $ | 248,705 | | | Allocation of distributions in excess of (loss) income | (500,831) | | | (489,181) | | | (138,659) | | Series D Preferred Unit accretion (refer to Note 18) | (17,626) | | | (18,085) | | | (8,195) | | Loss to common unitholders attributable to the Merger (refer to Note 5) | — | | | — | | | (377,079) | | | Net loss attributable to common units | $ | (343,584) | | | $ | (248,130) | | | $ | (275,228) | | | | | | | | | Basic weighted-average common units outstanding | 109,155,117 | | | 107,789,030 | | | 99,490,495 | | | | | | | | | Diluted common units outstanding: | | | | | | | Basic weighted-average common units outstanding | 109,155,117 | | | 107,789,030 | | | 99,490,495 | | | Effect of dilutive potential common units | — | | | 65,669 | | | 40,677 | | | Diluted weighted-average common units outstanding | 109,155,117 | | | 107,854,699 | | | 99,531,172 | | | | | | | | | Basic and diluted net loss per common unit | $ | (3.15) | | | $ | (2.30) | | | $ | (2.77) | |
|