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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
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%

X

- 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

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- Definition

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+ References

No definition available.

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