Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

Quarterly selected financial data for the years ended December 31, 2013 and 2012 is summarized below:

	March 31			June 30			September 30			December 31
	(b)			(a)			(a) (b)			(a) (b)
	(In thousands, except per share data)
2013:
Revenues	$	737,370		$	766,332		$	791,269		$	719,386
Gross profit (loss)	$	(18,560	)	$	2,505		$	90		$	(44,801	)
Asset impairment and mine closure costs	$	—		$	20,482		$	200,397		$	—
Goodwill impairment	$	—		$	—		$	—		$	265,423
Loss from operations	$	(51,431	)	$	(36,279	)	$	(234,753	)	$	(340,678	)
Loss from continuing operations	$	(84,316	)	$	(80,351	)	$	(207,767	)	$	(372,794	)
Income from discontinued operations, net of tax	$	14,267		$	8,145		$	79,404		$	1,580
Net loss	$	(70,049	)	$	(72,206	)	$	(128,363	)	$	(371,214	)
Diluted loss per common share
Loss from continuing operations	$	(0.40	)	$	(0.38	)	$	(0.98	)	$	(1.76	)
Net loss attributable to Arch Coal, Inc.	$	(0.33	)	$	(0.34	)	$	(0.61	)	$	(1.75	)

	March 31			June 30			September 30			December 31
	(b)			(a)			(a)			(a)
	(In thousands, except per share data)
2012:
Revenues	$	960,237		$	965,685		$	975,170		$	867,034
Gross profit	$	37,715		$	47,163		$	53,017		$	12,516
Asset impairment and mine closure costs	$	—		$	525,583		$	(2,144	)	$	15,743
Goodwill impairment	$	—		$	115,791		$	—		$	214,889
Income (loss) from operations	$	27,797		$	(596,893	)	$	119,242		$	(307,158	)
Income (loss) from continuing operations	$	(14,099	)	$	(442,456	)	$	24,673		$	(307,033	)
Income from discontinued operations, net of tax	$	15,508		$	7,032		$	21,078		$	11,610
Net income (loss)	$	1,409		$	(435,424	)	$	45,751		$	(295,423	)
Diluted income (loss) per common share
Income (loss) from continuing operations	$	(0.07	)	$	(2.09	)	$	0.12		$	(1.45	)
Net loss attributable to Arch Coal, Inc.	$	0.01		$	(2.05	)	$	0.22		$	(1.39	)