Off-Balance Sheet Guarantees and Long Term Standby Purchase Commitments - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 1,300	$ 1,300	$ 1,300
Operating Leases, Future Minimum Payments Due, Next Twelve Months	1,392
Contractual Obligation, Due in Next Fiscal Year	996
Operating Leases, Future Minimum Payments, Due in Two Years	1,412
Contractual Obligation, Due in Second Year	356
Operating Leases, Future Minimum Payments, Due in Three Years	1,388
Contractual Obligation, Due in Third Year	0
Operating Leases, Future Minimum Payments, Due in Four Years	1,389
Contractual Obligation, Due in Fourth Year	0
Operating Leases, Future Minimum Payments, Due in Five Years	1,423
Contractual Obligation, Due in Fifth Year	0
Operating Leases, Future Minimum Payments, Due Thereafter	5,527
Contractual Obligation, Due after Fifth Year	0
Operating Leases, Future Minimum Payments Due	12,531
Contractual Obligation	$ 1,352