Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Schedule Of Long-Term Debt

Long-term debt consists of the following:

	September 30, 2012		December 31, 2011
6 5/8% senior notes due 2016	$	—	$	249,674
3.60% senior notes due 2022	248,842		—
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 “6 1/2% GO Zone Senior Notes Due 2035”)	89,000		89,000
6 1/2% senior notes due 2035 (the “6 1/2% IKE Zone Senior Notes Due 2035 ”)	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt	$	763,731	$	764,563