Long-Term Debt (GO Zone Act Senior Notes Due 2032) (Details) (GO Zone 6 3/4% Senior Notes Due 2032 [Member], USD $)			12 Months Ended		1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Redeemed Prior To November 1, 2017 [Member]	Dec. 31, 2011 Redeemed On Or After November 1, 2017 [Member]	Dec. 31, 2007 Gulf Opportunity Zone Act Of 2005 [Member]	Dec. 13, 2007 Gulf Opportunity Zone Act Of 2005 [Member]
Debt Instrument [Line Items]
Face amount						$ 250,000,000
Stated interest rate	6.75%	6.75%				6.75%
Maturity date					Nov. 01, 2032
Percentage of principal required if called			100.00%	100.00%
Minimum debt amount guaranteed by subsidiaries	5,000,000
Amount drawn from bond proceeds	$ 250,005,000