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Business Combination- Other (Details)
$ in Thousands, kr in Millions, R in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
DKK (kr)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
ZAR (R)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2020
Business Acquisition [Line Items]                  
Cash Paid for Acquisitions             $ 3,132 $ 798,064  
Goodwill, Acquired During Period             531    
Mining North America [Member]                  
Business Acquisition [Line Items]                  
Cash Paid for Acquisitions         $ 500 $ 500      
Intangible assets           $ 1,000      
South Africa [Member]                  
Business Acquisition [Line Items]                  
Cash Paid for Acquisitions     $ 1,000 R 16.7          
Business Acquisition, Percentage of Voting Interests Acquired                 49.00%
Adjustments To Additional Paid In Capital Other     $ 700            
Tel Nordic ApS[Member]                  
Business Acquisition [Line Items]                  
Cash Paid for Acquisitions kr 20.0 $ 2,900              
Intangible assets   $ 2,400         $ 2,400    
Intangible Assets, Amortizable Life 17 years 17 years              
Goodwill, Acquired During Period   $ 500              
Business Combination Measurement Period             1 year    
Post Closing Adjustment kr 0.4 $ 100