XML 89 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1
Basis of Presentation - Schedule of Income and Expenses of Foreign Operations (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
USD [Member]      
Disclosure Of Basis Of Preparation [Line Items]      
Average exchange rate 18.9326 18.6568 16.1548
Euro [Member]      
Disclosure Of Basis Of Preparation [Line Items]      
Average exchange rate 1.1293 1.1066 1.1057