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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Preferred stock, no par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized 30,000,000us-gaap_PreferredStockSharesAuthorized 30,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, no par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized 160,000,000us-gaap_CommonStockSharesAuthorized 160,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 78,344,691us-gaap_CommonStockSharesIssued 78,228,339us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 78,344,691us-gaap_CommonStockSharesOutstanding 78,228,339us-gaap_CommonStockSharesOutstanding