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INVENTORY (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Composition of Inventory net of reserves    
Parts and supplies $ 240,682,000 $ 212,228,000
Work in progress 126,328,000 98,402,000
Finished goods 47,027,000 31,465,000
Inventory, net of reserves 414,037,000 342,095,000
Inventory reserves $ 12,900,000 $ 14,000,000