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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Summary of fair value instruments
The following table categorizes our fair value instruments according to the assumptions used to calculate those values at the end of each of the past two years:
 
Description
    
Fair Value Measurements Using
 
 
Asset /
(Liability)
Balance at
12/31/2011
  
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  
Significant Other
Observable Inputs
(Level 2)
  
Significant Unobservable Inputs
(Level 3)
 
             
Interest rate swaps
 $(9,039) $-  $(9,039) $- 
                  
Available-for-sale securities
  3,802   3,802   -   - 
                  
Deferred compensation plan assets
  7,973   -   7,973   - 
                  
Supplementary pension plan assets
  7,632   -   7,632   - 
                 
 
Description
    Fair Value Measurements Using 
 
Asset /
(Liability)
Balance at
12/31/2010
  
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  
Significant Other
Observable Inputs
(Level 2)
  
Significant Unobservable Inputs
(Level 3)
 
              
Interest rate swaps
 $(6,666) $-  $(6,666) $- 
                  
Available-for-sale securities
  14,168   14,168   -   - 
                  
Deferred compensation plan assets
  8,358   -   8,358   - 
                  
Supplementary pension plan assets
  7,676   -   7,676   -