v3.20.4
COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020 are as follows:
 Payments Due by Period
 20212022202320242025There-
after
Total
 (Thousands of Dollars)
Purchase obligations$9,980 $7,647 $2,039 $1,025 $483 $4,520 $25,694