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Summary of Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 38,185 | $ 21,619 | $ 19,521 | $ 29,648 | $ 21,193 | $ 17,701 | $ 18,418 | $ 14,602 | $ 108,973 |  | $ 71,914 |  | $ 64,538 |
Total operating costs and expenses | 18,831 | 16,153 | 15,552 | 14,552 | 10,175 | 9,104 | 14,053 | 11,253 | 65,088 |  | 44,585 |  | 44,912 |
Income tax (expense) benefit | (10,354) | (160) | 3,881 | (3,694) | 514 | 191,881 | (265) | (15) | (10,327) |  | 192,115 |  | (410) |
(Loss) income from continuing operations | (3,125) | 1,051 | (6,170) | 5,877 | 6,341 | 199,165 | 22,027 | (89) |  |  |  |  |  |
Income from discontinued operations |  |  |  | 731 |  |  |  |  | 731 |  | 0 |  | 0 |
Less: Net loss attributable to noncontrolling interests |  |  |  |  | 0 | 0 | (1,537) | (843) | 0 |  | (2,380) |  | (1,132) |
Net income | $ (3,125) | $ 1,051 | $ (6,170) | $ 6,608 | $ 6,341 | $ 199,165 | $ 23,564 | $ 754 | $ (1,636) |  | $ 229,824 |  | $ 12,024 |
Basic per share amounts(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (in usd per share) | $ 0.15 | $ 0.05 | $ (0.30) | $ 0.32 | $ 0.32 | $ 10.01 | $ 1.19 | $ 0.04 | $ (0.08) | [1] | $ 11.61 | [1] | $ 0.59 | [1]
Diluted per share amounts(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (in usd per share) | $ 0.15 | $ 0.05 | $ (0.30) | $ 0.30 | $ 0.29 | $ 9.28 | $ 1.11 | $ 0.04 | $ (0.08) | [1] | $ 10.83 | [1] | $ 0.56 | [1]
Weighted average shares—basic (shares) | 20,898 | 20,887 | 20,832 | 20,708 | 19,933 | 19,887 | 19,725 | 19,612 | 20,831 |  | 19,790 |  | 20,419 |
Weighted average shares—diluted (shares) | 20,898 | 22,997 | 20,832 | 22,284 | 21,542 | 21,460 | 21,276 | 20,631 | 20,831 |  | 21,228 |  | 21,433 |
[1] | The sum of net income per share amounts may not equal the total due to rounding

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