Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation And Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

Arch Coal, Inc. and Subsidiaries

Valuation and Qualifying Accounts

	Balance at Beginning    of Year	Additions     (Reductions) Charged to Costs and Expenses	Charged to        Other    Accounts	Deductions(a)	Balance at End of Year
	(In thousands)
Year ended December 31, 2011
Reserves deducted from asset accounts:
Other assets — other notes and accounts receivable	$           —	$            17	$          —	$        —	$          17
Current assets — supplies and inventory	12,701	1,755	—	1,349	13,107
Deferred income taxes	737	2,416	—	322	2,831
Year ended December 31, 2010
Reserves deducted from asset accounts:
Other assets — other notes and accounts receivable	$        109	$            —	$          —	$      109	$           —
Current assets — supplies and inventory	13,406	1,962	—	2,667	12,701
Deferred income taxes	1,120	(383)	—	—	737
Year ended December 31, 2009
Reserves deducted from asset accounts:
Other assets — other notes and accounts receivable	$        225	$           (17)	$          —	$        99	$        109
Current assets — supplies and inventory	12,760	1,302	—	656	13,406
Deferred income taxes	395	725	—	—	1,120

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(a) Reserves utilized, unless otherwise indicated.