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DEBT - Non-Recourse Notes (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended | 45 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | May 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Apr. 30, 2014
Debt |  |  |  |  |  |  |
Interest added to the principal balance of the non-recourse term notes due 2029 |  |  | $ 0 | $ 855 | $ 22,635 |  |
Payment of principal on non-recourse notes due 2029 |  |  | 487,189 | 6,828 | $ 0 |  |
Non-Recourse Notes | 2029 Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest added to the principal balance of the non-recourse term notes due 2029 |  |  |  |  |  | $ 44,000 |
Payment of principal on non-recourse notes due 2029 | $ 407,600 | $ 50,000 | $ 29,600 | $ 6,800 |  |  |
Write-off of debt issuance costs | $ 7,300 |  |  |  |  |  |
Non-Recourse Notes | 2029 Notes | Private Placement |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Non-Recourse Debt |  |  |  |  |  |  | $ 450,000
Interest rate (as a percent) |  |  |  |  |  |  | 9.00%
Debt issuance costs |  |  |  |  |  |  | $ 15,300

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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