Long-Term Debt (IKE Zone Act Senior Notes Due 2035) (Details) (IKE Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member], USD $)			12 Months Ended		1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Redeemed Prior To November 1, 2020 [Member]	Dec. 31, 2011 Redeemed On Or After November 1, 2020 [Member]	Dec. 31, 2010 Emergency Economic Stabilization Act Of 2008 [Member]	Dec. 02, 2010 Emergency Economic Stabilization Act Of 2008 [Member]
Debt Instrument [Line Items]
Face amount						$ 65,000,000
Stated interest rate	6.50%	6.50%				6.50%
Maturity date					Nov. 01, 2035
Percentage of principal required if called			100.00%	100.00%
Minimum debt amount guaranteed by subsidiaries	5,000,000
Amount drawn from bond proceeds	$ 17,299,000