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Nature Of Operations And Significant Accounting Policies (Summary Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Finished goods $ 111,794us-gaap_InventoryFinishedGoodsNetOfReserves $ 108,409us-gaap_InventoryFinishedGoodsNetOfReserves
Finished parts and subassemblies 42,510us-gaap_OtherInventoryNetOfReserves 36,645us-gaap_OtherInventoryNetOfReserves
Work in process 53,246us-gaap_InventoryWorkInProcessNetOfReserves 55,434us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 162,169us-gaap_InventoryRawMaterialsNetOfReserves 168,398us-gaap_InventoryRawMaterialsNetOfReserves
Total inventories $ 369,719us-gaap_InventoryNet $ 368,886us-gaap_InventoryNet