Common And Preferred Stock (Schedule Of Repurchases Of Shares) (Details) - Common Stock [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Class of Stock [Line Items]
Number of shares repurchased | shares	403,624
Cost of shares repurchased (in thousands of dollars) | $	$ 21,610
Weighted-average cost per share | $ / shares	$ 53.54