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Summary of Unaudited Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 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
Sep. 30, 2015
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 514 219,362 (265) (15) (280) (124) 47 (53) $ 219,083 219,596 (410) (374)
Income from continuing operations 6,341 226,646 22,027 (89) 6,730 777 1,288 2,097   257,305 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 $ 226,646 $ 23,564 $ 754 $ 7,055 $ 1,280 $ 1,592 $ 2,097 $ 250,964 $ 257,305 $ 12,024 $ 11,420
Basic per share amounts:                        
Net income (loss) (in usd per share) $ 0.32 $ 11.40 $ 1.19 $ 0.04 $ 0.35 $ 0.06 $ 0.08 $ 0.10 $ 12.71 $ 13.00 $ 0.59 $ 0.56
Diluted per share amounts:                        
Net income (loss) (in usd per share) $ 0.29 $ 10.56 $ 1.11 $ 0.04 $ 0.34 $ 0.06 $ 0.07 $ 0.10 $ 11.88 $ 12.12 $ 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