Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2013

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt

	December 31,
	2013		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 (7.93% and 7.43% weighted average interest rate for December 31, 2013 and 2012, respectively)	11,182		19,103
Other long-term notes maturing at various dates through 2031 (total value of $5,923 and $7,300 less unamortized discount of $1,050 and $1,542 at December 31, 2013 and December 31,2012, respectively).	4,873		5,758
	3,118,920		3,127,726
Less amounts due in one year *	2,957		4,126
Long-Term Debt	$	3,115,963	$	3,123,600

Schedule of Maturities of Long-term Debt [Table Text Block]

Annual undiscounted maturities on long-term debt during the next five years are as follows:

Year ended December 31,	Amount
2014	$	3,364
2015	4,276
2016	3,457
2017	1,502,484
2018	1,403
Thereafter	1,609,159
Total Long-Term Debt Maturities	$	3,124,143