Annual report pursuant to Section 13 and 15(d)

Commitments (Details)

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Commitments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Commitments [Abstract]      
2012 $ 21,187    
2013 17,858    
2014 15,449    
2015 12,884    
2016 11,620    
Thereafter 17,004    
Annual non-cancelable minimum lease payments, Total 96,002    
Rent expense $ 22,734 $ 21,393 $ 20,211