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Debt Obligations (5.55% Senior Unsecured Notes) (Details) | Sep. 30, 2018 | Jan. 31, 2010
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5.55% senior unsecured notes due January 15, 2020 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated rate | 5.55% | 5.55%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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