Net Income per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 21,545	$ 110,447
Denominator:
Weighted average number of shares outstanding—basic (in shares)	51,106	51,511
Dilutive restrictive stock awards	167	119
Weighted average number of shares outstanding—diluted (in shares)	51,273	51,630
Net income per share—basic and diluted (in dollars per share)	$ 0.42	$ 2.14
Net income per share—diluted (in dollars per share)	$ 0.42	$ 2.14