Balance Sheet Information (Details 2) (USD $)	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Restricted Cash
Restricted cash			$ 2,061,000	$ 2,017,000
Accounts Receivable, net
Allowance for doubtful accounts receivable (in dollars)			500,000	500,000
Inventories
Materials			44,219,000	36,523,000
Work in process			17,248,000	13,363,000
Finished goods			6,222,000	9,921,000
Inventories			67,689,000	59,807,000
Cost Method Investment
Total recorded investment			14,500,000	14,500,000
Percentage ownership of preferred shares			15.30%
Percentage ownership of cost method investee			12.00%
Additional cost method investment	800,000	800,000
Collateral for Bank Guarantees
Restricted Cash
Restricted cash			$ 2,100,000	$ 2,000,000