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Borrowings - Schedule of Senior Notes (Footnote) (Details) - Unsecured Debt [Member] - 6.625 Senior Notes, Due 2019 [Member] | 6 Months Ended
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Jun. 30, 2018
Minimum [Member] |
Debt Instrument [Line Items] |
Redemption period, notice | 30 days
Maximum [Member] |
Debt Instrument [Line Items] |
Redemption period, notice | 60 days
May 15, 2018 [Member] |
Debt Instrument [Line Items] |
Redemption price | 100.00%

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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 + Details
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