Share Repurchase Program (Number and Cost of Share Repurchased) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]
Cost of shares repurchased	$ 30,041
May 2012 Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	3,558,600	0
Cost of shares repurchased	30,041	0
May 2011 Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	0	2,714,289
Cost of shares repurchased	$ 0	$ 35,000