Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 11,162	$ 8,109
Accumulated amortization of operating lease	46,045	26,121
Accumulated amortization of intangibles	$ 143,097	$ 123,735
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	87,850,292	87,850,292
Treasury stock, shares (in shares)	37,454,209	37,647,058