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Debt and Capital Leases - Senior Notes Outstanding (Details) - Recourse Debt | Dec. 31, 2017 | Dec. 07, 2017 | Dec. 31, 2016 | Aug. 02, 2016 | May 23, 2016
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Senior notes, due 2022 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 6.25% |  | 6.25% |  |
Senior notes, due 2024 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 6.25% |  | 6.25% |  |
Senior notes, due 2026 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 7.25% |  |  |  | 7.25%
Senior notes, due 2027 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 6.625% |  |  | 6.625% |
Senior notes, due 2028 |  |  |  |  |
Debt Instrument |  |  |  |  |
Interest rate, stated percentage | 5.75% | 5.75% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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