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Inventories, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 154,518 $ 148,513
Work in process 74,636 75,331
Finished goods 254,620 237,507
Inventory, gross 483,774 461,351
Less: customer progress payments (15,076) (14,624)
Less: allowance for excess, slow-moving and obsolete inventory (41,371) (42,870)
Inventories, net $ 427,327 $ 403,857