Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ (6,042)	$ (25,299)
Adjustments to reconcile to cash from operating activities:
Depreciation, depletion and amortization	25,797	31,308
Accretion on asset retirement obligations	5,437	5,006
Deferred income taxes	372	(605)
Employee stock-based compensation expense	3,885	3,962
Amortization relating to financing activities	1,326	971
Gain on property insurance recovery related to Mountain Laurel longwall		(9,000)
Loss (Gain) on disposals and divestitures, net	(188)	(214)
Changes in:
Receivables	(18,929)	23,728
Inventories	(28,387)	(19,088)
Income taxes, net	13,827	(39,201)
Coal derivative assets and liabilities, including margin account	(33)	(1,073)
Other	8,621	17,470
Cash provided by operating activities	5,686	(12,035)
Investing activities
Capital expenditures	(76,758)	(87,690)
Minimum royalty payments	(62)	(62)
Proceeds from disposals and divestitures	188	233
Purchases of short term investments		(17,196)
Proceeds from sales of short term investments	34,981	23,221
Investments in and advances to affiliates, net	(1,114)	(739)
Proceeds from property insurance recovery related to Mountain Laurel longwall		7,353
Cash used in investing activities	(42,765)	(74,880)
Financing activities
Payments on term loan due 2024	(750)	(750)
Proceeds from equipment financing		53,611
Proceeds from tax exempt bonds	44,985
Net payments on other debt	(9,536)	(5,544)
Debt financing costs	(1,194)	(422)
Dividends paid		(7,645)
Payments for taxes related to net share settlement of equity awards	(1,316)	(198)
Cash provided by (used in) financing activities	32,189	39,052
Increase (decrease) in cash and cash equivalents, including restricted cash	(4,890)	(47,863)
Cash and cash equivalents, including restricted cash, beginning of period	193,445	153,020
Cash and cash equivalents, including restricted cash, end of period	188,555	105,157
SUPPLEMENTAL CASH FLOW INFORMATION
Cash and cash equivalents	169,593	105,157
Restricted cash	18,962
Cash and cash equivalents, including restricted cash, end of period	$ 188,555	$ 105,157

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