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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Consolidated Balance Sheets |  |
Allowance for doubtful accounts | $ 5,577 | $ 4,813
Accumulated depreciation of property, plant and equipment | $ 1,669,168 | $ 1,633,827

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