Short-Term Borrowings (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Financing and Security Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000,000	$ 50,000,000
Line of Credit Facility, Expiration Date 1		Oct. 31, 2014
Line of Credit Facility, Interest Rate Description	LIBOR plus 1.0
Line of Credit Facility, Remaining Borrowing Capacity	50,000,000	50,000,000
Financing and Security Agreement [Member] | Maximum [Member]
Line of Credit Facility, Interest Rate Description		LIBOR market index rate plus 2.25
Financing and Security Agreement [Member] | Minimum [Member]
Line of Credit Facility, Interest Rate Description	LIBOR plus 1.0
Amended and Restated Financing and Security Agreement [Member]
Line of Credit Facility Provision to Increase Borrowing Capacity	$ 75,000,000	$ 75,000,000