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Assets held for sale	3 Months Ended
	Mar. 31, 2012
Assets Held For Sale Disclosure [Abstract]
Assets held for sale	5.  Assets held for sale In March 2012, the Company completed the sale of two buildings in Frederick, Maryland for $12.2 million. These buildings had been classified as assets held for sale.  The Company realized proceeds equal to the carrying value, less cost to sell, of these buildings and there was no gain or loss on the sale.

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- Definition

The disclosure for assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, impairments, if any and other pertinent information as necessary.

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