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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Financial assets and liabilities measured at fair value on a recurring basis
                             
                        
(Thousands of dollars)         Quoted Prices in
Active  Markets for
Identical Assets
(Level 1)
          Significant
Unobservable
Inputs

(Level 3)
     Fair Value at
March 31,
2012
      Significant Other
Observable Inputs
(Level 2)
   

Assets:

                           

Deferred compensation plan asset (1)

  $ 19,026     $ 17,815     $ 1,211      
   

 

 

   

 

 

   

 

 

     
         

Liabilities:

                           

Deferred compensation plan liability (2)

  $ 25,665     $ 25,665              
   

 

 

   

 

 

             

 

(1) 

The deferred compensation plan asset consists of the investment funds maintained for the future payments under the Company’s executive deferred compensation plan, which is structured as a rabbi trust. 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 $18,842.

(2) 

The deferred compensation plan liability is the Company’s liability under its executive deferred compensation plan. The liability represents the fair value of the participant shadow accounts, and the value is based on quoted market prices.