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Inventory, net (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Composition of Inventory net of reserves    
Parts and supplies $ 233,312,000 $ 232,737,000
Work in progress 176,115,000 120,930,000
Finished goods 51,677,000 34,043,000
Inventory, net 461,104,000 387,710,000
Inventory reserves $ 13,600,000 $ 11,700,000