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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Revenues |  | $ 163,267 | $ 185,554
COSTS AND EXPENSES |  |  |
Costs applicable to sales | [1] | 99,340 | 114,490
Amortization |  | 30,777 | 38,693
General and administrative |  | 8,804 | 10,125
Exploration |  | 6,683 | 5,252
Pre-development, reclamation, and other |  | 4,225 | 3,837
Total costs and expenses |  | 149,829 | 172,397
OTHER INCOME (EXPENSE), NET |  |  |
Fair value adjustments, net, pretax |  | 4,987 | (1,200)
Interest expense, net of capitalized interest |  | (5,965) | (3,579)
Other, net |  | 180 | 20,799
Total other income (expense), net |  | (798) | 16,020
Total |  | 12,640 | 29,177
Income and mining tax benefit (expense) |  | (11,949) | (10,878)
Income (loss) from continuing operations |  | 691 | 18,299
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 550 | 364
Net income (loss) |  | 1,241 | 18,663
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax: |  |  |
Unrealized gain (loss) on debt and equity securities |  | (278) | (2,182)
Reclassification adjustments for impairment of equity securities |  | 0 | 121
Reclassification adjustments for realized (gain) loss on sale of equity securities |  | 0 | 1,471
Other comprehensive income (loss) |  | (278) | (590)
COMPREHENSIVE INCOME (LOSS) |  | $ 963 | $ 18,073
Basic EPS |  |  |
Income (Loss) from Continuing Operations, Per Basic Share |  | $ 0.004 | $ 0.10
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  | 0.003 | 0.00
Earnings Per Share, Basic |  | 0.007 | 0.10
Diluted EPS |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share |  | 0.004 | 0.10
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  | 0.003 | 0.00
Earnings Per Share, Diluted |  | $ 0.007 | $ 0.10
[1] | Excludes amortization.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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