Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Interest expense, borrowings:
Interest expense	$ 22,452	$ 21,547	$ 61,756	$ 62,126
Capitalized interest	(958)	(330)	(2,380)	(717)
Amortization of transaction costs	807	888	2,298	2,442
Interest expense resulting from derivatives	3,106	3,614	9,806	10,893
Total interest expense	$ 25,407	$ 25,719	$ 71,480	74,744
Write-off of transaction costs related to early extinguishment of debt				298
Fees on early extinguishment of debt				3,783
Fees and amortization on early extinguishment of debt				4,081
Total			$ 71,480	$ 78,825