v3.19.3.a.u2

COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Payments for Operating Leases and Purchase Obligations [Table Text Block] | Future minimum rental payments applicable to all noncancellable purchase obligations as of December 31, 2019 are as follows:
| Payments Due by Period
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | There- after |  | Total
| (Thousands of Dollars)
Purchase obligations | $ | 8,935 |  |  | $ | 7,643 |  |  | $ | 6,202 |  |  | $ | 1,485 |  |  | $ | 812 |  |  | $ | 5,157 |  |  | $ | 30,234 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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