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Basic and Diluted Income (Loss) Per Common Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income (loss) attributable to common stock and participating preferred stockholders $ 152,763 $ (6,670) $ 171,727 $ (40,453)
Participating shares at end of period:        
Weighted-average Common stock outstanding (in shares) 44,326 43,013 44,175 42,555
Unvested Restricted Stock (in shares) 384 0 350 0
Preferred stock (as-converted basis) (in shares) 4,787 0 4,787 0
Total (in shares) 49,497 43,013 49,312 42,555
Percentage of loss allocated to:        
Common stock 89.60% 100.00% 89.60% 100.00%
Unvested Restricted Stock 0.80% 0.00% 0.70% 0.00%
Preferred stock 9.70% 0.00% 9.70% 0.00%
Net Income (loss) attributable to Common stock, Basic $ 136,804 $ (6,670) $ 153,838 $ (40,453)
Distributed and Undistributed earnings to Common Shareholders:        
Effect of assumed shares under treasury stock method for stock options and restricted shares 397 0 378 0
Income from the dilutive impact of subsidiary securities 0 0 0 0
Net Income (loss) attributable to Common stock, Diluted $ 137,201 $ (6,670) $ 154,216 $ (40,453)
Denominator for basic and diluted earnings per share        
Weighted-average Common stock outstanding (in shares) 44,326 43,013 44,175 42,555
Effect of assumed shares under treasury stock method for stock options and restricted shares (in shares) 1,891 0 1,400 0
Weighted average common shares outstanding - diluted (in shares) 46,217 43,013 45,575 42,555
Net income (loss) attributable to Participating security holders (in usd per share) $ 3.09 $ (0.16) $ 3.48 $ (0.95)
Net income (loss) attributable to Participating security holders (in usd per share) $ 2.97 $ (0.16) $ 3.38 $ (0.95)