Research and Development (Details) (USD $)			3 Months Ended				9 Months Ended				68 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 COTS Agreement - Cost-Sharing Arrangement Terms with NASA [Member]		Sep. 30, 2012 COTS Agreement - Cost-Sharing Arrangement Terms with NASA [Member]		Sep. 30, 2013 COTS Agreement - Cost-Sharing Arrangement Terms with NASA [Member]		Sep. 30, 2012 COTS Agreement - Cost-Sharing Arrangement Terms with NASA [Member]		Sep. 30, 2013 COTS Agreement - Cost-Sharing Arrangement Terms with NASA [Member]		Sep. 30, 2013 Antares Development Program [Member]	Sep. 30, 2012 Antares Development Program [Member]	Sep. 30, 2013 Antares Development Program [Member]	Sep. 30, 2012 Antares Development Program [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Aggregate cash milestone payments to partially fund project costs			$ 288,000,000				$ 288,000,000				$ 288,000,000
Estimated total project costs			535,000,000				535,000,000				535,000,000
Deferred revenue and customer advances	27,103,000	62,098,000
Research and development costs incurred			17,400,000	[1]	21,200,000	[1]	48,900,000	[1]	53,500,000	[1]	529,400,000	[1]
Less amounts funded by NASA			(1,500,000)		(6,000,000)		(5,300,000)		(21,500,000)		(287,500,000)	[2]
Net research and development expenses			15,900,000		15,200,000		43,600,000		32,000,000		241,900,000
Cash Received From NASA			286,000,000				286,000,000				286,000,000
Receivable From NASA			2,000,000				2,000,000				2,000,000
Research and development expenses													1,700,000	9,900,000	14,000,000	29,600,000
Research and development expenses incurred to date													$ 248,800,000		$ 248,800,000

[1] Includes associated general and administrative expenses.

[2] Through September 30, 2013, the company has received $286 million in cash from NASA and as of September 30, 2013, the company recorded an approximately $2 million receivable due from NASA.