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Property, Plant and Equipment	3 Months Ended
Property, Plant and Equipment	Mar. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	(7) Property, Plant and Equipment The company received proceeds of $10.0 million in the first quarter of 2014 in connection with the sale of certain property and equipment at the NASA Wallops Facility to the Commonwealth of Virginia.

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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