Customer Concentration (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Spirit [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	29.20%	12.60%	29.00%	12.50%
Percentage of accounts receivable attributable to customer (in hundredths)			23.40%		27.90%
Gulfstream [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	15.30%	16.80%	16.80%	16.30%
Percentage of accounts receivable attributable to customer (in hundredths)			18.10%		5.60%
Boeing [Member]
Revenue and Accounts Receivable, Major Customer [Line Items]
Percentage of revenue attributable to customer (in hundredths)	15.00%	20.10%	16.40%	20.30%
Percentage of accounts receivable attributable to customer (in hundredths)			9.00%		11.30%