CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts receivable, net of allowances	$ 11,180	$ 12,118
Accumulated depreciation and amortization	$ 940,670	$ 905,512
Common stock of $.10 par value:
Common stock, par value (in usd per share)	$ 0.10	$ 0.10
Class A Common Stock
Common stock of $.10 par value:
Authorized shares (in shares)	300,000,000	300,000,000
Issued shares (in shares)	178,813,118	177,883,703
Treasury shares (in shares)	17,019,167	14,896,012
Class B Common Stock
Common stock of $.10 par value:
Authorized shares (in shares)	780,724	780,724
Issued shares (in shares)	780,724	780,724