Credit Facility and Capital Leases (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2011 Maximum [Member]	Sep. 30, 2012 Before July 5, 2013 [Member]	Sep. 30, 2012 After July 5, 2013 [Member]	Sep. 30, 2012 Letter of credit sublimit [Member]
Line of Credit Facility [Line Items]
Line Of credit facility maximum borrowing capacity				$ 25,000,000	$ 30,000,000	$ 2,000,000
Weighted-average imputed interest rates for the capital lease agreements		3.80%	4.20%
Credit Facility and Capital Leases (Textual) [Abstract]
Line of credit facility reduction in commitment	10,000,000
Line Of Credit Agreement	P3Y
Commitment fee	0.45%
Interest rate	(0.50%)
LIBOR rate	2.00%
Terminated credit facility	20,000,000
Interest rate for borrowings under credit facility	2.20%
Outstanding balance of revolving credit facility	$ 850,000
Underlying property and equipment expiration period	September 2019