Short-Term Borrowings (Narrative) (Details) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2009 days	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Integra Bank [Member]	Dec. 31, 2010 Treasury [Member]
Short-term Debt [Line Items]
Revolving credit facility	$ 30,000,000
Maturity date of line of credit facility	April 2010
Percentage of interest, in addition to LIBOR rate	2.00%
Maturity period, days	364
Effective interest rate				7.26%	0.00%
Note payable		424,849,000	298,232,000	100,000
Treasury funds					$ 9,200,000
Maturity date				Jan. 01, 2012