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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventories    
Raw materials and purchased components $ 161,942us-gaap_InventoryRawMaterialsNetOfReserves $ 147,292us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 61,437us-gaap_InventoryWorkInProcessNetOfReserves 53,131us-gaap_InventoryWorkInProcessNetOfReserves
Total inventories $ 223,379us-gaap_InventoryNet $ 200,423us-gaap_InventoryNet