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Summary of Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 21,193 | $ 17,701 | $ 18,418 | $ 14,602 | $ 22,999 | $ 14,973 | $ 10,608 | $ 15,958 | $ 71,914 | $ 64,538 | $ 48,973
Total operating costs and expenses | 10,175 | 9,104 | 14,053 | 11,253 | 13,363 | 11,441 | 9,250 | 10,858 | 44,585 | 44,912 | 34,030
Income tax (expense) benefit | 514 | 191,881 | (265) | (15) | (280) | (124) | 47 | (53) | 192,115 | (410) | (374)
Income from continuing operations | 6,341 | 199,165 | 22,027 | (89) | 6,730 | 777 | 1,288 | 2,097 | 229,824 | 12,024 | 8,832
Less: Net loss attributable to noncontrolling interests | 0 | 0 | (1,537) | (843) | (325) | (503) | (304) | 0 | (2,380) | (1,132) |
Net income | $ 6,341 | $ 199,165 | $ 23,564 | $ 754 | $ 7,055 | $ 1,280 | $ 1,592 | $ 2,097 | $ 229,824 | $ 12,024 | $ 11,420
Basic per share amounts: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (in usd per share) | $ 0.32 | $ 10.01 | $ 1.19 | $ 0.04 | $ 0.35 | $ 0.06 | $ 0.08 | $ 0.10 | $ 11.61 | $ 0.59 | $ 0.56
Diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (in usd per share) | $ 0.29 | $ 9.28 | $ 1.11 | $ 0.04 | $ 0.34 | $ 0.06 | $ 0.07 | $ 0.10 | $ 10.83 | $ 0.56 | $ 0.55
Weighted average number of common shares-basic (shares) | 19,933,000 | 19,887,000 | 19,725,000 | 19,612,000 | 19,878,000 | 20,417,000 | 20,738,000 | 20,601,000 | 19,789,991 | 20,418,569 | 20,312,395
Weighted average number of common shares-diluted (shares) | 21,542,000 | 21,460,000 | 21,276,000 | 20,631,000 | 20,792,000 | 21,345,000 | 21,780,000 | 21,208,000 | 21,227,887 | 21,433,178 | 20,745,454

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