Indebtedness (Schedule of Long-Term Debt Maturities) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Mar. 31, 2015
Years Ending March 31, [Abstract]
2016	[1]	$ 250,118
2017	[1]	325,175
2018	[1]	330,004
2019	[1]	351,348
2020	[1]	400,000
Thereafter	[1]	550,000
Total maturities of long-term debt	[1]	2,206,645
Senior notes, net [Member]
Years Ending March 31, [Abstract]
Unamortized discounts		$ 1,718	$ 1,392

[1] Outstanding borrowings under the Securitization Agreement at March 31, 2016 are reflected as maturing at the agreement’s expiration in December 2018.The Senior Notes are reflected in the debt maturity schedule at their maturity values rather than their carrying values, which are net of aggregate discounts of $1.7 million at March 31, 2016.