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Long-term Debt - Senior Notes Redemption Prices (Details) - Senior Notes [Member] | 12 Months Ended
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Dec. 31, 2017
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 101.00%
5.125% Senior Notes Due 2023 [Member] | Redemption Period One [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 103.844%
5.125% Senior Notes Due 2023 [Member] | Redemption Period Two [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 102.563%
5.125% Senior Notes Due 2023 [Member] | Redemption Period Three [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 101.281%
5.125% Senior Notes Due 2023 [Member] | Redemption Period Four [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 100.00%
5.75% Senior Notes Due 2024 [Member] | Redemption Period One [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 102.875%
5.75% Senior Notes Due 2024 [Member] | Redemption Period Two [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 101.917%
5.75% Senior Notes Due 2024 [Member] | Redemption Period Three [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 100.958%
5.75% Senior Notes Due 2024 [Member] | Redemption Period Four [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 100.00%
5.75% Senior Notes Due 2025 [Member] | Redemption Period One [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 102.875%
5.75% Senior Notes Due 2025 [Member] | Redemption Period Two [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 101.917%
5.75% Senior Notes Due 2025 [Member] | Redemption Period Three [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 100.958%
5.75% Senior Notes Due 2025 [Member] | Redemption Period Four [Member] |
Debt Instrument, Redemption [Line Items] |
Redemption price, (percent) | 100.00%

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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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- 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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