Fair Value Measurements Input Hierarchy of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	$ 0	$ 0	$ 0
Securitized beneficial interests	0	0	0
Total Assets	0	0	0
Guarantees	0	0	0
Derivative financial instruments, liabilities	0	0	0
Total liabilities	0	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0	0
Securitized beneficial interests	21,081	40,368	20,796
Total Assets	21,081	40,368	20,796
Guarantees	4,759	7,350	5,852
Derivative financial instruments, liabilities	0	0	0
Total liabilities	4,759	7,350	5,852
Total Assets / Liabilities, at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0	0
Securitized beneficial interests	21,081	40,368	20,796
Total Assets	21,081	40,368	20,796
Guarantees	4,759	7,350	5,852
Derivative financial instruments, liabilities	0	0	0
Total liabilities	$ 4,759	$ 7,350	$ 5,852