XML 28 R18.htm IDEA: XBRL DOCUMENT v3.8.0.1
Revenue (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue    
Disclosure information about remaining performance obligation Practical Expedient true  
Financing Component Practical Expedient true  
Sales Commissions Practical Expedient true  
International | Geographic Concentration Risk | Revenues    
Revenue    
Percentage of sales 29.00%  
International | Calculated under Revenue Guidance in Effect before Topic 606 | Geographic Concentration Risk | Revenues    
Revenue    
Percentage of sales   30.00%