Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Receivables [Line Items]
Accounts Receivable Not Expected to be Substantially Collected within One Year	$ 1.5
Percentage of Accounts Receivable Not Expected to be Collected Within One Year related to Receivables from Direct Sales to U.S. Government	91.20%
Customer Contracts [Member] | Accounts Receivable [Member]
Receivables [Line Items]
Concentration Risk, Percentage	15.30%	28.00%