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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Trade accounts receivable, allowance for doubtful accounts | $ 1,613 | $ 1,614
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, issued (in shares) | 78,234 | 80,053
Common stock, outstanding (in shares) | 78,234 | 80,053

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