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Redeemable Noncontrolling Interest (Tables)
12 Months Ended
Dec. 31, 2019
Noncontrolling Interest [Abstract]  
Summary of Redeemable Noncontrolling Interest
The following depicts changes to the balance of the redeemable noncontrolling interest:
 
Redeemable Noncontrolling
Interest
(Thousands of dollars)
 
Balance, December 31, 2017
$

Redeemable noncontrolling interest acquired
81,659

Net income attributable to redeemable noncontrolling interest
172

Balance, December 31, 2018
81,831

Net income attributable to redeemable noncontrolling interest
2,711

Balance, December 31, 2019
$
84,542