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Inventory, net (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Composition of Inventory net of reserves    
Parts and supplies $ 255,368 $ 269,370
Work in progress 98,298 100,499
Finished goods 47,179 33,702
Inventory, net 400,845 403,571
Inventory reserves 33,500 $ 20,200
Increase in inventory reserves related to restructuring charges $ 9,707