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Summary of Unaudited Quarterly Financial Information - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 50,465 | $ 33,375 | $ 27,995 | $ 29,267 | $ 59,590 | $ 45,663 | $ 90,043 | $ 56,157 | $ 251,453 |  | $ 141,102 |  | $ 108,973 |
Total operating costs and expenses | 22,113 | 16,882 | 14,980 | 19,051 | 26,441 | 22,301 | 19,868 | 19,116 | 87,726 |  | 73,026 |  | 65,088 |
Income tax (expense) benefit | (37,674) | (3,645) | (2,242) | (1,114) | 14,307 | (11,864) | (22,419) | (10,033) | (30,009) |  | (44,675) |  | (10,327) |
Net Income (loss) | $ (7,007) | $ 8,426 | $ 6,058 | $ 5,079 | $ (42,482) | $ 67,362 | $ 73,160 | $ 45,279 | $ 143,321 |  | $ 12,556 |  | $ (1,636) |
Basic per share amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) - Basic (USD per share) | $ (0.33) | $ 0.40 | $ 0.29 | $ 0.24 | $ (2.02) | $ 3.19 | $ 3.45 | $ 2.13 | $ 6.77 | [1] | $ 0.60 | [1] | $ (0.08) | [1]
Diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) - Diluted (USD per share) | $ (0.33) | $ 0.36 | $ 0.26 | $ 0.22 | $ (2.02) | $ 2.80 | $ 2.99 | $ 1.83 | $ 5.96 | [1] | $ 0.53 | [1] | $ (0.08) | [1]
Weighted average shares—basic (shares) | 21,109 | 21,071 | 21,013 | 20,938 | 21,071 | 21,148 | 21,212 | 21,209 | 21,160 |  | 21,032 |  | 20,831 |
Weighted average shares—diluted (shares) | 21,109 | 23,551 | 23,216 | 23,019 | 21,071 | 24,052 | 24,438 | 24,800 | 24,067 |  | 23,481 |  | 20,831 |
[1] | The sum of net income per share amounts may not equal the total due to rounding

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