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ACQUISITIONS (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
ACQUISITIONS    
Carrying amount of goodwill $ 211,237,000 $ 211,019,000
Carrying amount of goodwill in foreign countries 9,800,000 9,600,000
Carrying amount of customer contracts and other intangible assets 139,580,000 137,526,000
Carrying amount of customer contracts and other intangible assets in foreign countries $ 6,400,000 $ 6,500,000