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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 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
Goodwill acquired during year 665
Impairment losses (196,807)
Impact of foreign currency translation (538)
Goodwill, Ending Balance 284,376
Accumulated impairment losses, Ending Balance (284,376)
Aftermarket Services
  
Change in the net carrying amount of goodwill  
Goodwill, Beginning Balance 63,095
Total Goodwill, Beginning Balance 63,095
Goodwill acquired during year 447
Impairment losses (63,299)
Impact of foreign currency translation (243)
Goodwill, Ending Balance 63,299
Accumulated impairment losses, Ending Balance (63,299)
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
Goodwill acquired during year 218
Impairment losses (133,508)
Impact of foreign currency translation (295)
Goodwill, Ending Balance 221,077
Accumulated impairment losses, Ending Balance $ (221,077)