Fair Value Measurements Input Hierarchy of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 0	$ 1,373	$ 0
Securitized beneficial interests	0	0	0
Total Assets	0	1,373	0
Guarantees	0	0	0
Derivative financial instruments	0	0	0
Total liabilities	0	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0	0	0
Securitized beneficial interests	21,792	40,712	35,252
Total Assets	21,792	40,712	35,252
Guarantees	4,865	8,650	7,272
Derivative financial instruments	0	0	0
Total liabilities	4,865	8,650	7,272
Total Assets / Liabilities, at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	0	1,373	0
Securitized beneficial interests	21,792	40,712	35,252
Total Assets	21,792	42,085	35,252
Guarantees	4,865	8,650	7,272
Derivative financial instruments	0	0	0
Total liabilities	$ 4,865	$ 8,650	$ 7,272