Debt Disclosure (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Long-term debt

Long-term debt, presented net of unamortized discount and unamortized debt issuance costs, consists of the following:

	December 31,
	2021		2020
	(Thousands)
7.125% unsecured debentures due 2025	$	85,000	$	85,000
4.0% unsecured debentures due 2027	500,000		500,000
Unamortized debt issuance costs	(3,059)		(3,581)
Unamortized debt discount	(2,911)		(3,401)
Total long-term debt	$	579,030	$	578,018