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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Summary of Income Tax Examinations The following lists the earliest tax years open to examination by tax authorities where we have significant operations:
 
 
 
 
Jurisdiction                                 
 
Periods
United States
 
2014
United Kingdom
 
2017
Norway
 
2015
Angola
 
2013
Brazil
 
2014
Australia
 
2015