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Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity (Textual) [Abstract]        
Dividend per share $ 0.28 $ 0.27 $ 0.55 $ 0.53
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