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Liability for income taxes (Tables)
12 Months Ended
Dec. 31, 2011
Accrued Income Taxes [Abstract]  
Liability for Income Taxes [Table Text Block]
 (Amounts in thousands)Amount  
 Balance at January 1, 2010$ 7,450  
      
 Additions based on tax positions related to the current year  328  
 Additions for tax positions of prior years  376  
 Reduction for tax positions of prior years  (5,113)  
 Settlements & other, net  -  
 Balance at December 31, 2010  3,041  
      
 Additions based on tax positions related to the current year  -  
 Additions for tax positions of prior years  136  
 Reduction for tax positions of prior years  (2,561)  
 Settlements & other, net  (49)  
 Balance at December 31, 2011$ 567