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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Summary of Valuation of Investments and Financial Instruments Pricing Levels

The following table summarizes the valuation of our investments and financial instruments by the above pricing levels as of the valuation dates listed:

 

 

 

June 30, 2019

 

 

 

Total

 

 

(Level 1)

 

 

(Level 2)

 

 

 

(Thousands of dollars)

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Money market mutual funds

 

$

88,217

 

 

$

88,217

 

 

$

 

Deferred compensation plan assets

 

 

889

 

 

 

889

 

 

 

 

Total

 

$

89,106

 

 

$

89,106

 

 

$

 

 

 

 

December 31, 2018

 

 

 

Total

 

 

(Level 1)

 

 

(Level 2)

 

 

 

(Thousands of dollars)

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Money market mutual funds

 

$

26,308

 

 

$

26,308

 

 

$

 

Deferred compensation plan assets

 

 

772

 

 

 

772

 

 

 

 

Total

 

$

27,080

 

 

$

27,080

 

 

$