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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

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