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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets:    
Allowance for doubtful accounts $ 73,829 $ 75,176
Contract asset, allowance for doubtful accounts 3,139 3,205
Accumulated depreciation on property, plant and equipment 1,087,994 1,093,348
Other assets, allowance for credit loss $ 66,783 $ 67,842
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) 46,496 46,768