Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

v2.4.1.9
CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare    
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized    
Common stock, shares issued 119,757,582us-gaap_CommonStockSharesIssued 119,077,473us-gaap_CommonStockSharesIssued    
Common stock, shares outstanding 115,700,447us-gaap_CommonStockSharesOutstanding 115,382,538us-gaap_CommonStockSharesOutstanding    
Treasury stock, shares 4,057,135us-gaap_TreasuryStockShares 3,694,935us-gaap_TreasuryStockShares 3,553,085us-gaap_TreasuryStockShares 3,391,592us-gaap_TreasuryStockShares