Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue		$ 199,469	$ 148,795	$ 516,462	$ 482,049
COSTS AND EXPENSES
Amortization		45,678	31,184	130,758	91,420
General and administrative		9,635	7,729	26,859	24,183
Pre-development, reclamation, and other		4,851	8,121	13,619	15,966
Total costs and expenses		207,009	172,048	591,112	477,281
OTHER INCOME (EXPENSE), NET
Loss on debt extinguishments		(1,282)	0	(1,282)	0
Fair value adjustments, net, pretax		4,377	715	8,201	2,907
Interest expense, net of capitalized interest		(5,980)	(5,818)	(19,259)	(17,801)
Other, net		(3,634)	(20,903)	(2,931)	(19,846)
Total other income (expense), net		(6,519)	(26,006)	(15,271)	(34,740)
Total		(14,059)	(49,259)	(89,921)	(29,972)
Income and mining tax (expense) benefit		(218)	(3,785)	13,986	(19,451)
Income (loss) from continuing operations		(14,277)	(53,044)	(75,935)	(49,423)
Income (loss) from discontinued operations		0	0	5,693	550
NET INCOME (LOSS)		(14,277)	(53,044)	(70,242)	(48,873)
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax:
Unrealized gain (loss) on hedger, net of tax		1,132	0	1,132	0
Unrealized gain (loss) on debt and equity securities		0	192	59	(173)
Other comprehensive income (loss)		1,132	192	1,191	(173)
COMPREHENSIVE INCOME (LOSS)		$ (13,145)	$ (52,852)	$ (69,051)	$ (49,046)
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share		$ (0.06)	$ (0.29)	$ (0.36)	$ (0.27)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0	0	0.03	0
Earnings Per Share, Basic	[1]	(0.06)	(0.29)	(0.33)	(0.26)
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share		(0.06)	(0.29)	(0.36)	(0.27)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0	0	0.03	0
Earnings Per Share, Diluted	[1]	$ (0.06)	$ (0.29)	$ (0.33)	$ (0.26)
Product [Member]
COSTS AND EXPENSES
Costs applicable to sales	[2]	$ 140,952	$ 116,857	$ 404,550	$ 324,443
Mineral, Exploration [Member]
COSTS AND EXPENSES
Costs applicable to sales		5,893	$ 8,157	$ 15,326	$ 21,269
OTHER INCOME (EXPENSE), NET
Loss on debt extinguishments		$ (1,282)

[1] Due to rounding, the sum of net income per share from continuing operations and discontinued operations may not equal net income per share.

[2] Excludes amortization.