Net Income (Loss) per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ (9,161)	$ 125,481	$ 12,384	$ 235,928
Denominator:
Weighted average number of shares outstanding—basic (in shares)	51,187	51,553	51,147	51,532
Dilutive restrictive stock awards	101	128	108	109
Weighted average number of shares outstanding—diluted (in shares)	51,288	51,681	51,255	51,641
Net income per share—basic (in dollars per share)	$ (0.18)	$ 2.43	$ 0.24	$ 4.58
Net income per share—diluted (in dollars per share)	$ (0.18)	$ 2.43	$ 0.24	$ 4.57