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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Consolidated Balance Sheets    
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 30,000us-gaap_PreferredStockSharesAuthorized 30,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 300,000us-gaap_CommonStockSharesAuthorized 300,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 113,633us-gaap_CommonStockSharesIssued 112,849us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 113,513us-gaap_CommonStockSharesOutstanding 112,729us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 120us-gaap_TreasuryStockShares 120us-gaap_TreasuryStockShares