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DESCRIPTION OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues and Notes Payable (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2017 | May 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2014
Revenue recognition |  |  |  |  |  |
Allowance for doubtful accounts |  |  | $ 0 |  |  |
Amortization of Debt Issuance Costs from Non-Recourse Notes Due 2029 |  |  |  |  |  |
Payment of principal on non-recourse notes due 2029 |  |  | 487,189 | $ 6,828 | $ 0 |
Loss on extinguishment debt |  |  | (7,256) | 2,342 | $ 0 |
Income Taxes |  |  |  |  |  |
Unrecognized tax benefits would affect our effective income tax rate if recognized |  |  | 0 |  |  |
Non-Recourse Notes | 2029 Notes |  |  |  |  |  |
Amortization of Debt Issuance Costs from Non-Recourse Notes Due 2029 |  |  |  |  |  |
Payment of principal on non-recourse notes due 2029 | $ 407,600 | $ 50,000 | 29,600 | $ 6,800 |  |
Loss on extinguishment debt | $ (7,300) |  |  |  |  |
Non-Recourse Notes | Private Placement | 2029 Notes |  |  |  |  |  |
Amortization of Debt Issuance Costs from Non-Recourse Notes Due 2029 |  |  |  |  |  |
Non-Recourse Debt |  |  |  |  |  | $ 450,000
Interest rate (as a percent) |  |  |  |  |  | 9.00%
Debt issuance costs |  |  |  |  |  | $ 15,300
Strategic alliance - MABA program license |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |
Remaining deferred revenue performance obligation |  |  | $ 0 |  |  |

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