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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, 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
Quarterly Financial Information Disclosure [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 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 |
Exploration | 7,454 | 9,792 | 7,813 | 5,252 | 5,260 | 3,706 | 2,233 | 1,731 | 30,311 |  | 12,930 |  | 11,521 |
Other Cost and Expense, Operating | 15,106 | 12,374 | 11,110 | 13,962 | 10,370 | 10,439 | 10,688 | 16,635 |  |  |  |  |  |
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. | (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) |
Cash provided by (used in) operating activities | 91,811 | 37,308 | 24,103 | 43,938 | 21,423 | 39,201 | 34,752 | 1,085 | 208,456 |  | 125,817 |  | 113,542 |
Capital expenditures | $ (47,054) | $ (28,982) | $ (37,107) | $ (23,591) | $ (28,134) | $ (22,626) | $ (21,971) | $ (21,651) | $ (136,734) |  | $ (94,382) |  | $ (88,973) |
Basic net income (loss) from continuing operations (USD per share) | $ 0.08 | $ (0.06) | $ (0.05) | $ 0.10 | $ (0.06) | $ 0.29 | $ 0.05 | $ (0.15) | $ 0.06 |  | $ 0.14 |  | $ (2.22) |
Basic net income (loss) from discontinued operations (USD per share) | (0.04) | (0.03) | (0.01) | 0.00 | 0.01 | 0.14 | 0.04 | 0.01 | (0.07) |  | 0.21 |  | (0.61) |
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) |
Diluted net income (loss) from continuing operations (USD per share) | 0.04 | (0.09) | (0.06) | 0.10 | (0.05) | 0.42 | 0.09 | (0.14) | 0.06 |  | 0.14 |  | (2.22) |
Diluted net income (loss) from discontinued operations (USD per 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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