Earnings Per Share - Weighted Average Shares Outstanding for Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per share — Basic:
Net income	$ 6,081	$ 1,244	$ 13,094	$ 2,648	$ 7,325	$ 15,742
Weighted-average shares outstanding — Basic	65,401		64,265		65,209	64,143
Net income per common share — Basic	$ 0.09		$ 0.20		$ 0.11	$ 0.25
Earnings per share — Diluted:
Net income	$ 6,081	$ 1,244	$ 13,094	$ 2,648	$ 7,325	$ 15,742
Weighted-average shares outstanding — Basic	65,401		64,265		65,209	64,143
Effect of potentially dilutive securities	159		592		236	219
Weighted-average shares outstanding — Diluted	65,560		64,857		65,445	64,362
Net income per common share — Diluted	$ 0.09		$ 0.20		$ 0.11	$ 0.24