6. Long-Term Debt

Long-term debt consists of the following:


	March 31, 2012		December 31, 2011
6⁵/₈% senior notes due 2016	$	249,694	$	249,674
6 ¹/2% senior notes due 2029		100,000		100,000
6 ³/4% senior notes due 2032		250,000		250,000
6 ¹/2% senior notes due 2035 (the "2035 GO Zone 6 ¹/2% Notes")		89,000		89,000
6 ¹/2% senior notes due 2035 (the "2035 IKE Zone 6 ¹/2% Notes")		65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027		10,889		10,889

Long-term debt	$	764,583	$	764,563

The Company has a $400,000 senior secured revolving credit facility. At March 31, 2012, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of March 31, 2012, the Company had outstanding letters of credit totaling $15,715 and borrowing availability of $384,285 under the revolving credit facility.