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, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share — Basic:
Net income	$ 10,455	$ (824)	$ 6,081	$ 1,244	$ 9,631	$ 7,325
Weighted-average shares outstanding — Basic	66,688		65,401		66,493	65,209
Net income per common share — Basic	$ 0.16		$ 0.09		$ 0.14	$ 0.11
Earnings per share — Diluted:
Net income	$ 10,455	$ (824)	$ 6,081	$ 1,244	$ 9,631	$ 7,325
Weighted-average shares outstanding — Basic	66,688		65,401		66,493	65,209
Effect of potentially dilutive securities	1		159			236
Weighted-average shares outstanding — Diluted	66,689		65,560		66,493	65,445
Net income per common share — Diluted	$ 0.16		$ 0.09		$ 0.14	$ 0.11