Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Consolidated Balance Sheets [Abstract]
Properties and equipment, at cost, accumulated depreciation	$ 347,909	$ 335,920
Identifiable intangible assets, accumulated amortization	$ 46,449	$ 67,716
Capital stock - authorized	80,000,000	80,000,000
Capital stock - par value	$ 1	$ 1
Capital stock - issued	37,013,253	36,795,792
Treasury stock	22,005,711	21,920,993