Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2013

Commitments And Contingencies [Abstract]

Schedule Of Purchased Coal Expenses

	Three months ended March 31,
	2013	2012
	(in thousands)
Purchased coal expense	$              972	$           5,226

Schedule Of Lease And Royalty Expense

	Three months ended March 31,
	2013	2012
	(in thousands)
Lease expense	$              867	$              695
Royalty expense	$           2,908	$           4,286