Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Interest expense, borrowings:
Interest expense	$ 29,629	$ 24,085
Capitalized interest	(1,765)	(1,313)
Amortization of transaction costs	932	843
Interest expense resulting from derivatives	1,549	2,811
Total interest expense	$ 30,345	$ 26,426