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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 19, 2017
Jun. 30, 2017
Robtec [Member]    
Business Acquisition [Line Items]    
Acquired ownership percentage   70.00%
Acquisition date   Nov. 25, 2014
Easyway [Member]    
Business Acquisition [Line Items]    
Acquired ownership percentage   65.00%
Acquisition date   Apr. 02, 2015
Subsequent Event [Member] | Easyway [Member]    
Business Acquisition [Line Items]    
Acquired ownership percentage 5.00%  
Value of voting rights acquired $ 2.3