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Borrowings - Schedule of Senior Notes (Footnote) (Details) - Unsecured Debt [Member] - 6.625 Senior Notes, Due 2019 [Member]	3 Months Ended
	Mar. 31, 2018
Minimum [Member]
Debt Instrument [Line Items]
Redemption period, notice	30 days
Maximum [Member]
Debt Instrument [Line Items]
Redemption period, notice	60 days
On or After May 15, 2017 [Member]
Debt Instrument [Line Items]
Redemption price	103.313%
May 15, 2018 [Member]
Debt Instrument [Line Items]
Redemption price	100.00%

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+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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