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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Per share amount of cash dividends declared $ 0.48 $ 0.44 $ 0.40
Retained Earnings [Member]      
Per share amount of cash dividends declared $ 0.48 $ 0.44 $ 0.40