MERGER Table - Merger Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jul. 20, 2018 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
|
| Business Combinations [Abstract] | ||||||
| Fair value of incremental NS common units issued | $ 335,106 | |||||
| NSH debt and net current liabilities assumed | 52,075 | |||||
| Transaction costs, including accrued costs | 15,897 | |||||
| Total consideration | 403,078 | |||||
| Carrying value of general partner interest | $ 25,999 | $ 0 | $ 0 | $ 37,826 | ||
| Loss to common unitholders attributable to the Merger | $ 377,079 | $ 0 | $ (377,079) | $ 0 | ||
| Basic weighted-average common units outstanding | 104,264,796 | 93,031,320 | 96,920,202 | 87,392,597 | ||
| Loss per common unit attributable to the Merger | $ (3.62) | |||||