Long-Term Debt (GO Zone Act Senior Notes Due 2035) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2010	Jul. 31, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 02, 2010	Jul. 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