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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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CONDENSED CONSOLIDATED BALANCE SHEETS |  |
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 13,059 | $ 14,779
Accumulated depreciation | $ 879,395 | $ 884,647

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