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Fair value measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table presents the Company’s financial assets and liabilities that were accounted for at fair value as of December 31, 2011 (amounts in thousands):
 
 
Fair Value Measurements Using:
 
 
Quoted Market
Prices in Active
Markets (Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Assets:
 
 

 
 

 
 

Deferred compensation plan assets
 
$

 
$
15,333

 
$

Liabilities:
 
 

 
 

 
 

Deferred compensation plan liabilities
 
$

 
$
12,840

 
$