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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of allocation of the purchase price for all acquisitions      
Goodwill $ 3,043 $ 6,390 $ 40,703
Intangible assets with definite lives   1,642 8,148
Net assets (liabilities) (7) 16 3,580
Total $ 3,050 $ 8,016 $ 45,271