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Fair Value Measurements
9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
FAIR VALUE MEASUREMENTS
Accounting standards require that assets and liabilities carried at fair value will be classified and disclosed in one of the following three categories:
Level 1: Quoted market prices in active markets for identical assets or liabilities.
Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.
Level 3: Unobservable inputs that are not corroborated by market data.






The following table summarizes the valuation of our investments and financial instruments by the above pricing levels as of the valuation dates listed:
 
 
 
 
September 30, 2017
 
 
Total
 
(Level 1)
 
(Level 2)
 
 
(Thousands of dollars)
Investments:
 
 
 
 
 
 
Money market mutual funds
 
$
5,278

 
$
5,278

 
$

Commercial paper
 
9,413

 

 
9,413

U.S. Government agencies
 
13,491

 

 
13,491

Corporate bonds and notes
 
188,235

 

 
188,235

 
 
216,417

 
5,278

 
211,139

Deferred compensation plan assets
 
2,630

 
2,630

 

Total
 
$
219,047

 
$
7,908

 
$
211,139

 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
Total
 
(Level 1)
 
(Level 2)
 
 
(Thousands of dollars)
Investments:
 
 
 
 
Money market mutual funds
 
$
18,118

 
$
18,118

 
$

Commercial paper
 
27,867

 

 
27,867

U.S. government agencies
 
13,263

 

 
13,263

Corporate bonds and notes
 
243,582

 

 
243,582

 
 
302,830

 
18,118

 
284,712

Deferred compensation plan assets
 
2,394

 
2,394

 

Total
 
$
305,224

 
$
20,512

 
$
284,712



We hold our short-term investments in an investment fund consisting of high quality money market instruments of governmental and private issuers, which is classified as a short-term investment. Level 1 inputs are quoted prices (unadjusted) for identical assets or liabilities in active markets. These items are traded with sufficient frequency and volume to provide pricing on an ongoing basis. The fair values of the investments in these funds are based on observable market prices, and therefore, have been categorized in Level 1 in the fair value hierarchy. Level 2 inputs reflect quoted prices for identical assets or liabilities that are not actively traded. These items may not be traded daily; examples include commercial paper, corporate bonds and U.S. government agencies debt. There have been no reclassifications of assets between Level 1 and Level 2 investments during the periods covered by the financial statements included in this report. We hold no Level 3 investments. Investments reflected on our balance sheets as Other Assets, which we hold to fund liabilities under our Officers’ Deferred Compensation Plan, consist mainly of multiple investment funds that are highly liquid and diversified.
Cash, accounts receivable, accounts payable and accrued liabilities, and our revolving credit facility debt all had fair values approximating their carrying amounts at September 30, 2017 and December 31, 2016. Our determination of the estimated fair value of our 5.25% Senior Notes due 2019 and our revolving credit facility debt is derived using Level 2 inputs, including quoted market indications of similar publicly-traded debt. The fair value of our 5.25% Senior Notes due 2019, based on quoted market prices, was $489.2 million and $474.4 million at September 30, 2017 and December 31, 2016, respectively.