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
	Jun. 30, 2018	Jun. 30, 2017
Earnings per share — Basic:
Net income	$ 2,648	$ 3,896
Weighted-average shares outstanding — Basic	64,019	62,636
Net income per common share — Basic	$ 0.04	$ 0.06
Earnings per share — Diluted:
Net income	$ 2,648	$ 3,896
Weighted-average shares outstanding — Basic	64,019	62,636
Effect of potentially dilutive securities	35	7
Weighted-average shares outstanding — Diluted	64,054	62,643
Net income per common share — Diluted	$ 0.04	$ 0.06