Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Allowance for doubtful accounts	$ 82,517	$ 83,062
Contract asset, allowance for doubtful accounts	5,589	5,819
Accumulated depreciation on property, plant and equipment	1,183,972	1,172,957
Other assets, allowance for credit loss	$ 65,575	$ 66,377
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)	45,922	46,359