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Consolidated Statements of Changes in Equity [Parenthetical] (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Declaration of dividend per share (in dollars per share) $ 0.135us-gaap_CommonStockDividendsPerShareDeclared $ 0.125us-gaap_CommonStockDividendsPerShareDeclared $ 0.032us-gaap_CommonStockDividendsPerShareDeclared