Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Solar Star Funding, LLC [Member] - Letter of credit and reimbursement facility, Solar Star [Member] - Letter of Credit [Member] $ in Millions	Mar. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 320
Line of Credit Facility, Maximum Borrowing Capacity	301
Letters of Credit Outstanding, Amount	$ 284