Customer Concentration (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Spirit [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	28.70%	12.40%
Percentage of accounts receivable attributable to customer (in hundredths)	27.80%		27.90%
Gulfstream [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	18.20%	15.90%
Percentage of accounts receivable attributable to customer (in hundredths)	14.60%		5.60%
Boeing [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	17.80%	20.50%
Percentage of accounts receivable attributable to customer (in hundredths)	9.20%		11.30%