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GOODWILL (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Change in the net carrying amount of goodwill    
Goodwill, Beginning Balance   $ 284,249
Accumulated impairment losses, Beginning Balance   (87,569)
Total Goodwill, Beginning Balance   196,680
Impairment losses (196,142) (196,142)
Impact of foreign currency translation   (538)
Goodwill, Ending Balance 283,711 283,711
Accumulated impairment losses, Ending Balance (283,711) (283,711)
Aftermarket services
    
Change in the net carrying amount of goodwill    
Goodwill, Beginning Balance   63,095
Total Goodwill, Beginning Balance   63,095
Impairment losses   (62,852)
Impact of foreign currency translation   (243)
Goodwill, Ending Balance 62,852 62,852
Accumulated impairment losses, Ending Balance (62,852) (62,852)
Fabrication
    
Change in the net carrying amount of goodwill    
Goodwill, Beginning Balance   221,154
Accumulated impairment losses, Beginning Balance   (87,569)
Total Goodwill, Beginning Balance   133,585
Impairment losses   (133,290)
Impact of foreign currency translation   (295)
Goodwill, Ending Balance 220,859 220,859
Accumulated impairment losses, Ending Balance $ (220,859) $ (220,859)