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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Stockholders' equity: |  |
Common stock, par value (in dollars per share) | $ 0.0075 | $ 0.0075
Common shares, shares authorized (in shares) | 138,666,666 | 138,666,666
Common shares, shares outstanding (in shares) | 105,386,216 | 82,447,274

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