Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Details)

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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
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]                      
Revenues $ 143,422 $ 153,459 $ 149,612 $ 134,213 $ 129,099 $ 110,281 $ 123,323 $ 124,393      
Operating income (loss) 102,674 57,147 48,467 38,739 33,166 15,700 32,888 28,196 $ 247,027 $ 109,950 $ (330,568)
Net income (loss) $ 138,844 [1] $ 46,260 [1] $ 36,083 [1] $ 27,640 [1] $ 23,365 [1] $ (1,297) [1] $ 33,315 [1] $ 24,299 [1] $ 248,827 $ 79,682 $ (249,020)
Basic and diluted earnings per common share $ 0.96 $ 0.32 $ 0.25 $ 0.19 $ 0.16 $ (0.01) $ 0.23 $ 0.17 $ 1.72 $ 0.56 $ (2.60)
[1] During the fourth quarter of 2018, we recorded a gain on debt transactions of $47.1 million and a derivative gain of $59.7 million. During the first quarter of 2017, we recorded a gain on debt transactions of $7.8 million. See Note 2 and Note 9 for additional information.