Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock, par value $ 0.001 $ 0.001  
Common stock, shares authorized 300,000,000 300,000,000  
Common stock, shares issued 119,077,473 118,502,752  
Common stock, shares outstanding 115,382,538 114,949,667  
Treasury stock, shares 3,694,935 3,553,085 3,391,592