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Inventory, net (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Composition of Inventory net of reserves    
Parts and supplies $ 237,711,000 $ 232,737,000
Work in progress 169,709,000 120,930,000
Finished goods 48,275,000 34,043,000
Inventory, net 455,695,000 387,710,000
Inventory reserves $ 13,700,000 $ 11,700,000