Short-Term Borrowings (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Short-term Debt [Abstract]
Net proceeds from short-term debt	$ 2,800,000	$ 3,571,000
Debt Instrument, Unused Borrowing Capacity, Amount	43,635,000
Short-term Debt	2,800,000		0
Letters of Credit Outstanding, Amount	$ 3,600,000