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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 2,524 | $ 2,453
Accumulated depreciation (in dollars) | 120,119 | $ 123,599
Convertible Preferred Stock | Series 4 Convertible Preferred Stock |  |
Preferred Stock, Liquidation Preference, Value | $ 103,379 |

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