CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts receivable, allowance for credit loss	$ 12,637	$ 12,800
Accumulated depreciation and amortization	$ 882,583	$ 870,329
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)	177,507,685	176,951,162
Treasury shares (in shares)	13,893,393	13,189,925
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