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RESTRUCTURING CHARGES (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Changes to accrued liability balance related to restructuring charges    
Beginning balance   $ 1,776,000
Additions for costs expensed 1,266,000 4,313,000
Less non-cash expenses   (83,000)
Reductions for payments   (5,561,000)
Ending balance 445,000 445,000
Restructuring charges by segment    
Costs incurred in 2012   4,313,000
Cumulative costs incurred   15,907,000
Total expected costs   16,949,000
Estimated additional charges   1,000,000
North America contract operations
    
Restructuring charges by segment    
Costs incurred in 2012   491,000
Cumulative costs incurred   511,000
Total expected costs   560,000
International contract operations
    
Restructuring charges by segment    
Costs incurred in 2012   100,000
Cumulative costs incurred   602,000
Total expected costs   1,081,000
Aftermarket services
    
Restructuring charges by segment    
Costs incurred in 2012   118,000
Cumulative costs incurred   540,000
Total expected costs   591,000
Fabrication
    
Restructuring charges by segment    
Costs incurred in 2012   629,000
Cumulative costs incurred   2,203,000
Total expected costs   2,353,000
Other
    
Restructuring charges by segment    
Costs incurred in 2012   2,975,000
Cumulative costs incurred   12,051,000
Total expected costs   $ 12,364,000