BUSINESS SEGMENT INFORMATION (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Segment Reporting [Abstract]

Summarized financial information by segment

Summarized financial information by segment is as follows:

	Coal		Power			Heritage			Corporate			Consolidated
	(In thousands)
Three Months Ended March 31, 2014
Revenues	$	158,190	$	22,012		$	—		$	—		$	180,202
Restructuring charges	—		397			—			—			397
Depreciation, depletion, and amortization	13,459		2,524			—			76			16,059
Operating income (loss)	13,447		1,744			(3,830		)	(3,308		)	8,053
Total assets	697,916		167,998			15,622			525,611			1,407,147
Capital expenditures	3,053		35			—			(38		)	3,050
Three Months Ended March 31, 2013
Revenues	$	142,112	$	19,336		$	—		$	—		$	161,448
Depreciation, depletion, and amortization	11,801		2,531			—			94			14,426
Operating income (loss)	13,472		(1,003		)	(4,175		)	(2,560		)	5,734
Total assets	711,128		186,309			15,877			29,701			943,015
Capital expenditures	5,010		134			—			157			5,301

Summarized financial information by segment is as follows:

	Coal		Power		Heritage			Corporate			Consolidated
	(In thousands)
December 31, 2013
Revenues	$	587,119	$	87,567	$	—		$	—		$	674,686
Restructuring charges	—		5,078		—			—			5,078
Operating income (loss)	44,471		4,907		(14,498		)	(9,518		)	25,362
Depreciation, depletion, and amortization	56,698		10,179		—			354			67,231
Total assets	705,816		180,684		15,497			44,688			946,685
Capital expenditures	27,064		790		—			737			28,591
December 31, 2012
Revenues	$	519,152	$	81,285	$	—		$	—		$	600,437
Operating income (loss)	48,235		8,244		(14,711		)	(12,896		)	28,872
Depreciation, depletion, and amortization	46,639		10,085		—			421			57,145
Total assets	703,315		189,599		15,508			27,693			936,115
Capital expenditures	18,804		2,070		—			158			21,032
December 31, 2011
Revenues	$	414,928	$	86,785	$	—		$	—		$	501,713
Operating income (loss)	27,453		12,119		(19,675		)	(9,271		)	10,626
Depreciation, depletion, and amortization	35,112		10,176		—			306			45,594
Total assets	510,507		194,730		13,769			40,166			759,172
Capital expenditures	24,678		2,119		—			797			27,594

Reconciliation of segment operating income to income (loss)

A reconciliation of segment income (loss) from operations to loss before income taxes follows:

	Three Months Ended March 31,
	2014			2013
	(In thousands)
Income from operations	$	8,053		$	5,734
Interest expense	(20,798		)	(10,160		)
Interest income	302			297
Loss on foreign exchange	(6,790		)	—
Other income	93			70
Loss before income taxes	$	(19,140	)	$	(4,059	)

A reconciliation of segment income from operations to loss before income taxes follows:

	Years Ended
	2013			2012			2011
	(In thousands)
Income from operations	$	25,362		$	28,872		$	10,626
Loss on extinguishment of debt	(64		)	(1,986		)	(17,030		)
Interest expense	(39,937		)	(42,677		)	(29,769		)
Interest income	1,366			1,496			1,444
Other income (loss)	364			723			(2,572		)
Loss before income taxes	$	(12,909	)	$	(13,572	)	$	(37,301	)

Schedule of revenue by major customers by segment

The Company derives its revenues from a few key customers. The customers from which more than 10% of total revenue has been derived and the percentage of total revenue from those customers is summarized as follows:

	2013			2012			2011
	(In thousands)
Customer A – coal	$	117,545		$	126,982		$	120,243
Customer B – coal (1)	112,061			96,718			—
Customer C – coal	89,266			81,981			81,353
Customer D – power	86,390			80,109			85,639
Customer E – coal	85,929			66,128			65,224
Customer F – coal (2)	25,958			26,525			52,835
Percentage of total revenue	77		%	80		%	81		%

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(1) The revenue from Customer B did not exceed 10% in 2011.

(2) The revenue from Customer F did not exceed 10% in