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Inventory, net (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Composition of Inventory net of reserves    
Parts and supplies $ 244,202,000 $ 233,216,000
Work in progress 139,505,000 139,763,000
Finished goods 36,419,000 40,948,000
Inventory, net 420,126,000 413,927,000
Inventory reserves $ 20,400,000 $ 14,100,000