Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income (loss)	$ (191,467)	$ (266,090)	$ 242,350
Adjustments to reconcile to cash from operating activities:
Depreciation, depletion and amortization	32,630	94,105	82,122
Accretion on asset retirement obligations	4,947	14,939	15,411
Deferred income taxes		14,227	13,680
Employee stock-based compensation expense		13,907	17,305
Amortization relating to financing activities		3,189	2,757
Gain on property insurance recovery related to Mountain Laurel longwall		(23,518)
Gains on disposals and divestitures, net		(3,460)	(818)
Asset impairment	163,088	163,088
Preference Rights Lease Application settlement income		(23,518)	(39,000)
Changes in:
Receivables		47,416	(4,622)
Inventories		(12,499)	(46,073)
Accounts payable, accrued expenses and other current liabilities		(50,474)	1,569
Income taxes, net		22,855	32,440
Other		38,229	16,932
Cash provided by operating activities		55,914	334,053
Investing activities
Capital expenditures	(57,100)	(205,661)	(137,396)
Minimum royalty payments		(1,186)	(1,187)
Proceeds from disposals and divestitures		856	1,799
Purchases of short term investments		(76,593)	(158,578)
Proceeds from sales of short term investments		148,670	146,170
Investments in and advances to affiliates, net		(1,549)	(4,810)
Proceeds from property insurance recovery related to Mountain Laurel longwall		23,518
Cash used in investing activities		(111,945)	(154,002)
Financing activities
Payments on term loan due 2024		(2,250)	(2,250)
Proceeds from equipment financing		53,611
Proceeds from tax exempt bonds		53,090
Net payments on other debt		(19,347)	(12,077)
Debt financing costs		(3,528)
Dividends paid		(7,645)	(22,264)
Purchases of treasury stock			(232,999)
Payments for taxes related to net share settlement of equity awards		(346)
Other			30
Cash provided by (used in) financing activities		73,585	(269,560)
Increase (decrease) in cash and cash equivalents, including restricted cash		17,554	(89,509)
Cash and cash equivalents, including restricted cash, beginning of period	153,020		264,937
Cash and cash equivalents, including restricted cash, end of period	170,574	170,574	175,428
Cash and cash equivalents, including restricted cash, end of period
Cash and cash equivalents, including restricted cash	$ 170,574	$ 170,574	$ 175,428