v3.20.4
INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 31, 2020
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 PeriodDecember 31, 2020December 31, 2019
 CostAccumulated
Amortization
CostAccumulated
Amortization
 (Years)(Thousands of Dollars)
Customer contracts and relationships18$863,900 $(235,205)$863,900 $(183,832)
Other472,359 (845)2,359 (795)
Total$866,259 $(236,050)$866,259 $(184,627)