Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS (Details)

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ACQUISITIONS (Details) (USD $)
3 Months Ended
Mar. 31, 2013
item
Dec. 31, 2012
ACQUISITIONS    
Number of material acquisitions 0  
Carrying amount of goodwill $ 212,280,000 $ 212,477,000
Carrying amount of goodwill in foreign countries 9,600,000 9,800,000
Goodwill and intangible asset impairment 0  
Carrying amount of customer contracts and other intangible assets 136,458,000 141,789,000
Carrying amount of customer contracts and other intangible assets in foreign countries $ 5,200,000 $ 5,400,000