Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenue		$ 173,167	$ 154,870
COSTS AND EXPENSES
Amortization		36,162	41,876
General and administrative		8,920	9,474
Pre-development, reclamation, and other		6,555	4,434
Total costs and expenses		176,940	191,148
OTHER INCOME (EXPENSE), NET
Fair value adjustments, net, pretax		(8,819)	9,120
Interest expense, net of capitalized interest		(5,128)	(6,454)
Other, net		1,881	60
Total other income (expense), net		(12,066)	2,726
Total		(15,839)	(33,552)
Income and mining tax (expense) benefit		3,939	8,658
Income (loss) from continuing operations		(11,900)	(24,894)
Income (loss) from discontinued operations		0	5,693
NET INCOME (LOSS)		(11,900)	(19,201)
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax:
Unrealized gain (loss) on hedger, net of tax		206	0
Unrealized gain (loss) on debt and equity securities		0	59
Other comprehensive income (loss)		206	59
COMPREHENSIVE INCOME (LOSS)		$ (11,694)	$ (19,142)
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share		$ (0.05)	$ (0.12)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.00	0.03
Earnings Per Share, Basic	[1]	(0.05)	(0.09)
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share		(0.05)	(0.12)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0.00	0.03
Earnings Per Share, Diluted	[1]	$ (0.05)	$ (0.09)
Product
COSTS AND EXPENSES
Costs applicable to sales	[2]	$ 118,917	$ 131,650
Mineral, Exploration
COSTS AND EXPENSES
Costs applicable to sales		$ 6,386	$ 3,714

[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.