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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator for calculation of diluted earnings (loss) per share          
Net income (loss)   $ (6,948) $ 35,289 $ (27,056) $ (1,086)
Denominator for basic income (loss) per share          
Weighted-average shares outstanding   75,086 61,296 70,634 61,244
Dilutive effect of stock equivalents     675    
Denominator for diluted earnings (loss) per share   75,086 61,971 70,634 61,244
Basic earnings (loss) per share   $ (0.09) $ 0.58 $ (0.38) $ (0.02)
Diluted earnings (loss) per share   $ (0.09) $ 0.57 $ (0.38) $ (0.02)
Anti-dilutive securities excluded from diluted earnings (loss) per share calculation          
Common stock, New shares issued 13,500        
Stock Compensation Plan [Member]          
Anti-dilutive securities excluded from diluted earnings (loss) per share calculation          
Anti-dilutive stock equivalents   3,423 0 2,587 3,133