Annual report pursuant to Section 13 and 15(d)

GOODWILL (Details)

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GOODWILL (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
GOODWILL    
Carrying amount of goodwill in foreign countries $ 9,600,000 $ 9,400,000
Changes in the carrying amount of goodwill    
Goodwill balance at the beginning of the period 210,779,000 189,658,000
Goodwill acquired 429,000 21,288,000
Goodwill adjustments due to currency translation (189,000) (167,000)
Goodwill balance at the end of the period $ 211,019,000 $ 210,779,000