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Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue |  | $ 143,855 | $ 148,795 | $ 169,987 | $ 163,267 | $ 214,585 | $ 159,919 | $ 149,540 | $ 185,554 | $ 625,904 | $ 709,598 | $ 571,897
Pre-development, reclamation, and other |  |  |  |  |  | 15,106 | 12,374 | 11,110 | 13,962 | 20,043 | 18,936 | 14,411
Amortization |  | 37,053 | 31,184 | 29,459 | 30,777 | 44,722 | 32,401 | 30,733 | 38,693 | 128,473 | 146,549 | 116,528
Gross Profit |  | (9,705) | 754 | 32,282 | 33,150 | 47,881 | 25,959 | 16,578 | 32,371 |  |  |
Other Cost and Expense, Operating |  | 11,239 | 15,850 | 11,270 | 13,029 |  |  |  |  |  |  |
Income (loss) from continuing operations |  | 468 | (53,044) | 2,930 | 691 | 14,349 | (11,728) | (9,995) | 18,299 | (48,955) | 10,925 | 22,435
Income (loss) from discontinued operations |  | 0 | 0 | 0 | 550 | (6,724) | (4,924) | (960) | 364 | 550 | (12,244) | 32,917
NET INCOME (LOSS) |  | 468 | (53,044) | 2,930 | 1,241 | 7,625 | (16,652) | (10,955) | 18,663 | (48,405) | (1,319) | 55,352
Cash provided by (used in) activities of continuing operations |  | 72 | 5,789 | (1,294) | 15,541 | 91,811 | 37,308 | 24,103 | 43,938 | 20,108 | 197,160 | 96,461
Capital expenditures |  | $ (17,805) | $ (39,472) | $ (41,165) | $ (42,345) | $ (47,054) | $ (28,982) | $ (37,107) | $ (23,591) | $ (140,787) | $ (136,734) | $ (94,382)
Income (Loss) from Continuing Operations, Per Basic Share |  | $ 0.00 | $ (0.290) | $ 0.020 | $ 0.000 | $ 0.08 | $ (0.060) | $ (0.050) | $ 0.100 | $ (0.260) | $ 0.060 | $ 0.140
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  | 0.00 | 0.000 | 0.000 | 0.000 | (0.04) | (0.030) | (0.010) | 0.000 | 0.000 | (0.070) | 0.210
Earnings Per Share, Basic | [1] | 0.000 | (0.290) | 0.020 | 0.000 | 0.040 | (0.090) | (0.060) | 0.100 | (0.260) | (0.010) | 0.350
Income (Loss) from Continuing Operations, Per Diluted Share |  | 0.000 | (0.290) | 0.020 | 0.000 | 0.080 | (0.060) | (0.050) | 0.100 | (0.260) | 0.060 | 0.140
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  | 0.000 | 0.000 | 0.000 | 0.000 | (0.040) | (0.030) | (0.010) | 0.000 | 0.000 | (0.070) | 0.200
Earnings Per Share, Diluted | [1] | $ 0.000 | $ (0.290) | $ 0.020 | $ 0.000 | $ 0.040 | $ (0.090) | $ (0.060) | $ 0.100 | $ (0.260) | $ (0.010) | $ 0.340
Product [Member] |  |  |  |  |  |  |  |  |  |  |  |
Costs applicable to sales | [2] | $ 116,507 | $ 116,857 | $ 108,246 | $ 99,340 | $ 121,982 | $ 101,559 | $ 102,229 | $ 114,490 | $ 440,950 | $ 440,260 | $ 335,375
Mineral, Exploration [Member] |  |  |  |  |  |  |  |  |  |  |  |
Costs applicable to sales |  | $ 4,128 | $ 8,157 | $ 6,429 | $ 6,683 | $ 7,454 | $ 9,792 | $ 7,813 | $ 5,252 | $ 25,397 | $ 30,311 | $ 12,930
[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.

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