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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized (in shares) 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.06us-gaap_CommonStockParOrStatedValuePerShare $ 0.06us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 400,000,000us-gaap_CommonStockSharesAuthorized 400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 295,247,958us-gaap_CommonStockSharesIssued 291,156,046us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 295,247,958us-gaap_CommonStockSharesOutstanding 291,156,046us-gaap_CommonStockSharesOutstanding