Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (4,087)	$ (222)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	14,426	13,289
Accretion of asset retirement obligation and receivable	3,180	2,853
Non-cash tax benefits	0	(504)
Amortization of intangible assets and liabilities, net	164	162
Share-based compensation	2,386	1,902
Loss (gain) on sales of assets	(234)	38
Amortization of deferred financing costs	933	857
Loss (gain) on sales of investment securities	7	(52)
Changes in operating assets and liabilities:
Receivables, net	120	(7,370)
Inventories	(2,687)	(1,495)
Excess of black lung benefit obligation over trust assets	83	327
Accounts payable and accrued expenses	3,245	1,970
Deferred revenue	160	(86)
Income tax payable	27	0
Accrual for workers' compensation	(191)	(80)
Asset retirement obligation	(3,207)	(2,442)
Accrual for postretirement medical benefits	1,985	1,424
Pension and SERP obligations	742	597
Other assets and liabilities	4,164	1,820
Net cash provided by operating activities	21,216	12,988
Cash flows from investing activities:
Additions to property, plant and equipment	(5,301)	(4,420)
Change in restricted investments and bond collateral and reclamation deposits	(6,435)	(25,433)
Cash payments related to acquisitions	0	(72,522)
Net proceeds from sales of assets	441	20
Proceeds from sale of restricted investments	5,619	375
Receivable from customer for property and equipment purchases	(49)	(591)
Net cash used in investing activities	(5,725)	(102,571)
Cash flows from financing activities:
Change in book overdrafts	820	(116)
Borrowings from long-term debt, net of debt discount	0	119,364
Repayments of long-term debt	(6,573)	(5,445)
Borrowings on revolving lines of credit	6,000	0
Repayments of revolving lines of credit	(6,000)	0
Debt issuance and other refinancing costs	(156)	(4,556)
Preferred dividends paid	(340)	(340)
Net cash provided by (used in) financing activities	(6,249)	108,907
Net increase in cash and cash equivalents	9,242	19,324
Cash and cash equivalents, beginning of period	31,610	30,783
Cash and cash equivalents, end of period	$ 40,852	$ 50,107