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Acquisitions (Tables)
12 Months Ended
Dec. 31, 2020
Business Combinations [Abstract]  
Preliminary Puchase Price Allocation
(Thousands of dollars)LLOG
(Final)
Cash consideration paid $1,236,165 
Contingent consideration89,444 
Total purchase consideration1,325,609 
(Thousands of dollars)
Fair value of Property, plant and equipment1,356,185 
Other assets6,697 
Less:  Asset retirement obligations(37,273)
Total net assets$1,325,609