CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful receivables	$ 7,035	$ 3,723
Indefinite-lived and amortizable intangible assets, accumulated amortization	$ 235,582	$ 168,452
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	800,000,000	800,000,000
Common stock, Issued (in shares)	324,418,632	324,418,632
Treasury stock (in shares)	104,918,360	106,955,082