Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Allowance for doubtful accounts	$ 82,101	$ 74,336
Contract asset, allowance for doubtful accounts	3,999	2,393
Accumulated depreciation on property, plant and equipment	1,135,437	1,191,823
Other assets, allowance for credit loss	$ 66,210	$ 67,696
Shareholders’ equity:
Common shares, par value (in dollars per share)	$ 1.25	$ 1.25
Common shares, shares authorized (in shares)	305,000	305,000
Common shares, shares issued (in shares)	176,793	176,793
Treasury shares, shares (in shares)	46,376	46,794