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INVENTORY (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Composition of Inventory net of reserves    
Parts and supplies $ 238,525,000 $ 225,804,000
Work in progress 125,247,000 103,414,000
Finished goods 33,606,000 32,467,000
Inventory, net of reserves 397,378,000 361,685,000
Inventory reserves $ 16,700,000 $ 16,800,000