Debt, Financing Arrangements, and Leases (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019
	(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	(3,581)		(4,083)
Unamortized debt discount	(3,401)		(3,872)
Total long-term debt	$	578,018	$	577,045