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Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity (Textual) [Abstract]    
Dividend per share $ 0.27 $ 0.26
Accounting Standards Update 2014-09 [Member]    
Class of Stock [Line Items]    
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle $ 2.6