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Goodwill (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Gross carrying value of goodwill and the accumulated impairment charge            
Gross carrying value $ 146,259   $ 146,259      
Accumulated impairment charge (40,159)   (40,159)      
Net carrying value $ 106,100 $ 106,100 $ 106,100 $ 106,100 $ 146,259 $ 146,259