Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowances for losses on accounts receivable	$ 5,515	$ 7,861
Accumulated depreciation and amortization	$ 570,033	$ 546,397
Common stock, par value (in dollar per share)	$ 2	$ 2
Common stock, authorized (shares)	200,000	200,000
Common stock, issued (shares)	77,062	76,546
Commons stock, outstanding (shares)	77,062	76,546