Annual report pursuant to Section 13 and 15(d)

Summary of Unaudited Quarterly Financial Information (Details)

v3.6.0.2
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