Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS (Details)

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ACQUISITIONS (Details) (USD $)
6 Months Ended
Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
ACQUISITIONS      
Number of material acquisitions 0 0  
Carrying amount of goodwill $ 212,004,000   $ 212,477,000
Carrying amount of goodwill in foreign countries 9,400,000   9,800,000
Goodwill and intangible asset impairment 0    
Carrying amount of customer contracts and other intangible assets 131,122,000   141,789,000
Carrying amount of customer contracts and other intangible assets in foreign countries $ 5,100,000   $ 5,400,000