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Condensed Consolidated Balance Sheets (Unaudited) Parenthetical - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Accounts receivable, allowance | $ 2,176 | $ 3,006
Other acquired intangibles, accumulated amortization | $ 78,250 | $ 71,527
Shareholders' equity: |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, authorized shares (in shares) | 50,000,000 | 50,000,000
Common stock, issued shares (in shares) | 29,869,008 | 29,454,062
Common stock, outstanding shares (in shares) | 29,869,008 | 29,454,062

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