Commitments and Contingencies (Details Textual) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Commitments And Contingencies (Additional Textuals)
Reserve for uncertain taxes	$ 1,496
In the event certain new products are not shipped by a distributor to a customer within 90 days, the Company has agreed to purchase and take title to the product	90 days
Accrual related to contingent performance payments for XM-3 and XM-4	29,240
Additional payments required if XM-4 continues to operate above baseline specifications	10,000
Period beyond expected operating performance of design life for XM-4	5 years
Accrual related to contingent performance for FM-5	11,659
Accrual related to contingent performance for XM-5	$ 21,450
Operating lease terms	1-15 Years
FM-5, XM-5, XM-4 and XM-3 [Member]
Commitments and Contingencies (Textuals) [Abstract]
Operating performance over design life	15 years