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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 250,000,000 | 250,000,000
Common stock, shares issued | 140,733,683 | 137,507,010
Common stock, shares outstanding | 140,733,683 | 137,507,010

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