Long-Term Debt (GO Zone Act Senior Notes Due 2035) (Details) (GO 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 Gulf Opportunity Zone Act Of 2005 [Member]	Dec. 02, 2010 Gulf Opportunity Zone Act Of 2005 [Member]
Debt Instrument [Line Items]
Face amount						$ 89,000,000
Stated interest rate	6.50%	6.50%				6.50%
Maturity date					Nov. 01, 2035
Percentage of principal required if called			100.00%	100.00%
Amount drawn from bond proceeds	40,517,000
Minimum Debt Amount Guaranteed By Subsidiaries	5,000,000
Minimum debt amount guaranteed by subsidiaries	$ 5,000,000