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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
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Condensed Consolidated Balance Sheets |  |
Accounts receivable, accumulated provision for doubtful accounts (in dollars) | $ 18,180 | $ 18,335
Common stock, authorized shares | 320,000 | 320,000
Common stock, shares issued | 175,685 | 175,684
Treasury stock, shares | 26,226 | 26,531

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