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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 214,585 | $ 159,919 | $ 149,540 | $ 185,554 | $ 139,204 | $ 148,762 | $ 156,822 | $ 127,109 | $ 709,598 |  | $ 571,897 |  | $ 561,407 |
COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs applicable to sales | 121,982 | 101,559 | 102,229 | 114,490 | 84,903 | 84,594 | 81,820 | 84,058 | 440,260 | [1] | 335,375 | [1] | 403,827 | [1]
Amortization | 44,722 | 32,401 | 30,733 | 38,693 | 28,625 | 26,040 | 35,653 | 26,210 | 146,549 |  | 116,528 |  | 125,953 |
General and administrative |  |  |  |  |  |  |  |  | 33,616 |  | 29,275 |  | 32,636 |
Exploration | 7,454 | 9,792 | 7,813 | 5,252 | 5,260 | 3,706 | 2,233 | 1,731 | 30,311 |  | 12,930 |  | 11,521 |
Write-downs |  |  |  |  |  |  |  |  | 0 |  | 4,446 |  | 246,625 |
Pre-development, reclamation, and other |  |  |  |  |  |  |  |  | 18,936 |  | 14,411 |  | 16,204 |
Total costs and expenses |  |  |  |  |  |  |  |  | 669,672 |  | 512,965 |  | 836,766 |
OTHER INCOME (EXPENSE), NET |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | (9,342) |  | (21,365) |  | 15,916 |
Fair value adjustments, net, pretax |  |  |  |  |  |  |  |  | (864) |  | (11,581) |  | 5,202 |
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | (16,440) |  | (36,896) |  | (44,978) |
Other, net |  |  |  |  |  |  |  |  | 26,643 |  | 98 |  | (17,667) |
Total other income (expense), net |  |  |  |  |  |  |  |  | (3) |  | (69,744) |  | (41,527) |
Total |  |  |  |  |  |  |  |  | 39,923 |  | (10,812) |  | (316,886) |
Income and mining tax benefit (expense) |  |  |  |  |  |  |  |  | (28,998) |  | 33,247 |  | 29,075 |
Income (loss) from continuing operations | 14,349 | (11,728) | (9,995) | 18,299 | (10,328) | 46,123 | 8,280 | (21,640) | 10,925 |  | 22,435 |  | (287,811) |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | (6,724) | (4,924) | (960) | 364 | 2,020 | 23,436 | 6,217 | 1,244 | (12,244) |  | 32,917 |  | (79,372) |
Net income (loss) | $ 7,625 | $ (16,652) | $ (10,955) | $ 18,663 | $ (8,308) | $ 69,559 | $ 14,497 | $ (20,396) | (1,319) |  | 55,352 |  | (367,183) |
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on equity securities, net of tax of ($767) for the year ended December 31, 2016 |  |  |  |  |  |  |  |  | 3,227 |  | 3,222 |  | (4,154) |
Reclassification adjustments for impairment of equity securities |  |  |  |  |  |  |  |  | 426 |  | 703 |  | 2,346 |
Reclassification adjustments for realized (gain) loss on sale of equity securities |  |  |  |  |  |  |  |  | 1,354 |  | (2,691) |  | 894 |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 5,007 |  | 1,234 |  | (914) |
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | $ 3,688 |  | $ 56,586 |  | $ (368,097) |
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.08 | $ (0.06) | $ (0.05) | $ 0.10 | $ (0.06) | $ 0.29 | $ 0.05 | $ (0.15) | $ 0.06 |  | $ 0.14 |  | $ (2.22) |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | (0.04) | (0.03) | (0.01) | 0.00 | 0.01 | 0.14 | 0.04 | 0.01 | (0.07) |  | 0.21 |  | (0.61) |
NET INCOME (LOSS) PER SHARE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 0.04 | (0.09) | (0.06) | 0.10 | (0.05) | 0.43 | 0.09 | (0.14) | (0.01) |  | 0.35 |  | (2.83) |
Income (Loss) from Continuing Operations, Per Diluted Share | 0.04 | (0.09) | (0.06) | 0.10 | (0.05) | 0.42 | 0.09 | (0.14) | 0.06 |  | 0.14 |  | (2.22) |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | 0.08 | (0.06) | (0.05) | 0.10 | (0.06) | 0.28 | 0.05 | (0.15) | (0.07) |  | 0.20 |  | (0.61) |
Diluted (in dollars per share) | $ (0.04) | $ (0.03) | $ (0.01) | $ 0.00 | $ 0.01 | $ 0.14 | $ 0.04 | $ 0.01 | $ (0.01) |  | $ 0.34 |  | $ (2.83) |
[1] | Excludes amortization.

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