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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Stockholders' Equity [Abstract]      
Common stock issued, par value $ 0.01us-gaap_CommonStockNoParValue $ 0.01us-gaap_CommonStockNoParValue $ 0.01us-gaap_CommonStockNoParValue