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Debt - Senior Notes (Details) - Senior Notes | Jun. 30, 2015 | Dec. 31, 2014
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5.875% Senior Notes, Due 2024 |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.875% | 5.875%
5.125% Senior Notes, Due 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.125% | 5.125%
5.875% Senior Notes, Due 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.875% | 5.875%
6.625% Senior Notes, Due 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.625% | 6.625%

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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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