Annual report pursuant to Section 13 and 15(d)

NET INCOME (LOSS) PER SHARE - Calculation of Net Income (Loss) Per Share (Details)

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NET INCOME (LOSS) PER SHARE - Calculation of Net Income (Loss) Per 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
Numerator (both basic and diluted)                      
Net income (loss) relevant to common stockholders                 $ 173,862 $ 12,613 $ (53,147)
Denominator                      
Denominator for basic income (loss) per share (in shares) 83,758 83,544 83,447 83,081 83,040 83,040 83,040 55,996 83,460 76,371 44,787
Denominator for diluted income (loss) per share (in shares) 87,218 86,878 86,878 86,848 86,818 86,264 86,279 55,996 87,046 79,583 44,787
Basic net income (loss) per common share (in dollars per share) $ 0.62 $ 0.55 $ 0.47 $ 0.44 $ 0.12 $ 0.26 $ 0.06 $ (0.43) $ 2.08 $ 0.17 $ (1.19)
Diluted net income (loss) per common share (in dollars per share) $ 0.59 $ 0.53 $ 0.45 $ 0.42 $ 0.12 $ 0.25 $ 0.06 $ (0.43) $ 2.00 $ 0.16 $ (1.19)
Stock options                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 3,129 2,903 0
Performance stock units                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 277 59 0
Restricted stock units                      
Denominator                      
Dilutive effect of stock options/units (in shares)                 180 250 0