Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Financial assets and liabilities measured at fair value on a recurring basis

The following table presents the Company’s financial assets and liabilities that are measured at fair value on a recurring basis, categorized using the fair value hierarchy:

(Thousands of dollars)
			Quoted Prices
			in Active				Significant
	Fair Value at		Markets for		Significant Other		Unobservable
	September 30,		Identical Assets		Observable Inputs		Inputs
	2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Deferred compensation plan assets (1)	$	57,952	$	32,286	$	25,666
Liabilities:
Deferred compensation plan liabilities (2)	$	65,297	$	65,297

⁽¹⁾  The deferred compensation plan assets consist of the investment funds maintained for the future payments under the Company’s executive deferred compensation plans, which are structured as rabbi trusts. The investments are marketable securities accounted for under the Debt and Equity Securities Topic of the ASC. The level 1 investments are valued using quoted market prices multiplied by the number of shares. The level 2 investments are valued based on vendor or broker models. The cost basis of the investment funds is $54,034.

⁽²⁾ The deferred compensation plan liabilities are the Company’s liabilities under its executive deferred compensation plan. The liabilities represent the fair value of the participant shadow accounts, and the value is based on quoted market prices.