Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities and the Effects of Offsetting (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative asset, gross	$ 613	$ 3,526	[1]
Derivative asset, gross liability	(1)	(305)
Derivative asset, net	612	3,221
Cash collateral (received) pledged	0	0
Derivative asset, net amount recognized in balance sheet	612	3,221
Derivative liability, gross	(5,540)	(677)	[1]
Derivative liability, gross asset	1	305
Derivative liability, net	(5,539)	(372)
Cash collateral (received) pledged	0	0
Derivative liability, net amount recognized in balance sheet	$ (5,539)	$ (372)

[1] Certain immaterial amounts have been revised to correct the classification of derivatives.