CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts receivable, allowance for credit loss	$ 12,550	$ 12,800
Accumulated depreciation and amortization	$ 889,750	$ 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)	177,682,187	176,951,162
Treasury shares (in shares)	14,101,476	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