Annual report pursuant to Section 13 and 15(d)

Earnings/ (Loss) Per Share - Schedule of Calculation of Basic and Diluted Earnings (Loss) Per Common Share (Details)

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Earnings/ (Loss) Per Share - Schedule of Calculation of Basic and Diluted Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Per Share, Basic and Diluted [Abstract]                      
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)
Less portion allocated to nonvested shares                 9,727 3,244  
Net income (loss) allocated to common shares                 $ 239,100 $ 76,438 $ (249,020)
Weighted average common shares outstanding                 139,002 137,617 95,644
Basic and diluted earnings (loss) 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)
Shares excluded due to being anti-dilutive (weighted-average)                     5,269
[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.