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Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]          
Cash dividends declared per share $ 0.45 $ 0.45 $ 0.45 $ 0.90 $ 0.45