8.     GOODWILL

Goodwill represents the excess of the purchase price over the fair value of net assets of businesses acquired. The carrying amount of goodwill was $211.0 million as of December 31, 2011 and $210.8 million as of December 31, 2010. Goodwill increased $0.2 million for the year ended December 31, 2011 and $21.1 million for the year ended December 31, 2010 due primarily to acquisitions. The carrying amount of goodwill in foreign countries was $9.6 million as of December 31, 2011 and $9.4 million as of December 31, 2010. The changes in the carrying amount of goodwill for the twelve months ended December 30, 2011 and 2010 are as follows: