Debt - $110.0 million Credit Facility (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended						0 Months Ended					0 Months Ended
	May 14, 2012 Composite Engineering, Inc.	Jun. 24, 2012 Revolving credit facility	May 04, 2012 Revolving credit facility	Nov. 14, 2011 Revolving credit facility	Jul. 27, 2011 Revolving credit facility	Mar. 31, 2008 Revolving credit facility	Jul. 27, 2011 Revolving credit facility Minimum	Jul. 27, 2011 Revolving credit facility Maximum	Jul. 27, 2011 LIBOR base rate	Jul. 27, 2011 LIBOR base rate Minimum	Jul. 27, 2011 LIBOR base rate Maximum	Jul. 27, 2011 Base rate other than LIBOR	Jul. 27, 2011 Base rate other than LIBOR Minimum	Jul. 27, 2011 Base rate other than LIBOR Maximum	Jun. 24, 2012 Letter of credit	Jul. 27, 2011 Letter of credit	Jul. 27, 2011 Swing line loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 110.0		$ 90.0	$ 65.0	$ 85.0										$ 50.0	$ 10.0
Maturity period					5 years
Fixed charge coverage ratio							1.25
Maximum possible borrowing capacity subject to application and bank approval			135.0
Common stock issued to fund purchase of CEI (shares)	20.0
Description of variable rate basis									LIBOR			federal funds rate
Basis spread on variable rate										3.00%	3.75%		1.00%	1.75%
Base rate (the greater of prime rate or 0.5% over federal funds rate)												0.50%
Base rate (floor, 1.0% over one-month LIBOR)												1.00%
Commitment fee							0.50%	0.75%
Outstanding borrowings		0													12.3
Remaining borrowing capacity		$ 85.0