Inventory (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Schedule of Inventory [Line Items]
Inventory-related long-term purchase commitment 2011	$ 15,300,000
Inventory-related long-term purchase commitment 2012	30,200,000
Raw materials	12,860,000	9,801,000
Work-in-progress	9,572,000	7,183,000
Finished goods	6,729,000	8,359,000
Total	29,161,000	25,343,000
Inventory Related Long Term Purchase Commitment Year 3	$ 15,100,000