Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Taxes Unrecognized Tax Benefits Details
Balance at beginning of year	$ 2,881	$ 2,420	$ 2,165
Gross increases - tax position in prior period	0	82	27
Gross decreases - tax position in prior period	0	0	0
Gross increases - tax positions related to the current year	450	379	228
Balance at end of year	$ 3,331	$ 2,881	$ 2,420