Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting [Abstract]
Adjusted EBITDA	$ 45,328	$ 64,932	$ 127,100	$ 92,537
Depreciation, depletion and amortization	(97,372)	(102,464)	(202,246)	(206,887)
Amortization of acquired sales contracts, net	1,644	3,239	5,034	6,935
Asset impairment and mine closure costs	(19,146)	(1,512)	(19,146)	(1,512)
Interest expense, net	(98,612)	(95,924)	(195,491)	(190,552)
Nonoperating expense	(4,016)	0	(4,016)	0
Loss before income taxes	$ (172,174)	$ (131,729)	$ (288,765)	$ (299,479)