Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Interest expense, borrowings:
Interest expense	$ 34,196	$ 29,629
Capitalized interest	(419)	(1,765)
Amortization of transaction costs	961	932
Interest expense resulting from derivatives	516	1,549
Total interest expense	$ 35,254	$ 30,345