Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of aggregate minimum commitments

Aggregate minimum commitments under long-term raw material supply contracts for the next five years as of June 30, 2020 are listed below:

	(Thousands of Dollars)
2020	$	9,184
2021	16,755
2022	9,300
2023	2,400
2024	—
	$	37,639