v3.19.3.a.u2

INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block] | Intangible assets consisted of the following:
| Weighted-Average Amortization Period |  | December 31, 2019 |  | December 31, 2018
|  | Cost |  | Accumulated Amortization |  | Cost |  | Accumulated Amortization
| (Years) |  | (Thousands of Dollars)
Customer contracts and relationships | 18 |  | $ | 863,900 |  |  | $ | (183,832 | ) |  | $ | 863,950 |  |  | $ | (132,509 | )
Other | 47 |  | 2,359 |  |  | (795 | ) |  | 2,359 |  |  | (744 | )
Total |  |  | $ | 866,259 |  |  | $ | (184,627 | ) |  | $ | 866,309 |  |  | $ | (133,253 | )

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