Long-Term Debt (GO Zone Act Senior Notes Due 2035) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Jul. 31, 2010	Dec. 31, 2010	Dec. 31, 2013	Jul. 02, 2010	Dec. 02, 2010
Debt Instrument [Line Items]
Stated interest rate	6.50%
Minimum Debt Amount Guaranteed By Subsidiaries	5,000
GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
Debt Instrument [Line Items]
Stated interest rate	6.50%			6.50%
GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member] | Redeemed Prior To November 1, 2020 [Member]
Debt Instrument [Line Items]
Percentage of principal required if called	100.00%
GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member] | Redeemed On Or After November 1, 2020 [Member]
Debt Instrument [Line Items]
Percentage of principal required if called	100.00%
Gulf Opportunity Zone Act Of 2005 [Member]
Debt Instrument [Line Items]
Senior notes, principal amount issued					100,000
Maturity date		Aug. 01, 2029
Gulf Opportunity Zone Act Of 2005 [Member] | GO Zone 6 1/2% Tax-Exempt Revenue Bonds Due 2035 [Member]
Debt Instrument [Line Items]
Senior notes, principal amount issued						$ 89,000
Stated interest rate			6.50%
Maturity date			Nov. 01, 2035