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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Summary of changes in carrying amount of goodwill  
Beginning balance $ 92,750
Goodwill acquired during the period 9,409
Goodwill allocated to specific assets for business acquired in 2011 (3,300)
Goodwill adjustments for purchase price allocation of business acquired in 2011 282
Ending balance $ 99,141