Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2013

Long-term Debt, Other Disclosures [Abstract]

Schedule of Long-term Debt

	September 30, 2013		December 31, 2012
Debt:
Senior notes due April 2017 at 8.00%, issued at par value	$	1,500,000	$	1,500,000
Senior notes due April 2020 at 8.25%, issued at par value	1,250,000		1,250,000
Senior notes due March 2021 at 6.375%, issued at par value	250,000		250,000
MEDCO revenue bonds in series due September 2025 at 5.75%	102,865		102,865
Advance royalty commitments (7.43% weighted average interest rate for September 30, 2013 and December 31, 2012)	20,394		20,394
Other long-term notes maturing at various dates through 2031 (total value of $6,268 and $7,300 less unamortized discount of $1,166 and $1,542 at September 30, 2013 and December 31, 2012, respectively).	5,102		5,758
	3,128,361		3,129,017
Less amounts due in one year *	4,606		4,544
Long-Term Debt	$	3,123,755	$	3,124,473