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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash dividends per share $ 0.60 $ 0.60 $ 0.60
Retained earnings (deficit)      
Cash dividends per share $ 0.60 $ 0.60 $ 0.60