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Debt Covenant Ratios (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Jun. 30, 2018
Credit Agreement |  |
Debt Instrument [Line Items] |  |
Net total lease adjusted leverage ratio | 5.0 | 5.6
Net secured debt lease adjusted leverage ratio | 1.6 | 2.5
Bond leverage ratio, per indentures | 5.8 | 5.7
Fixed charge coverage ratio | 2.1 | 2.3
Credit Agreement | Maximum |  |
Debt Instrument [Line Items] |  |
Net total lease adjusted leverage ratio |  | 6.5
Net secured debt lease adjusted leverage ratio |  | 4.0
Bond leverage ratio, per indentures |  | 6.5
Credit Agreement | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed charge coverage ratio |  | 1.5
Senior Notes 4.875 Percent due 2027, GBP Notes due 2025 and 5.25 Percent Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Covenant, Indenture, Leverage Ratio Maximum |  | 7.0
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Repayments of Debt | $ 807,000 |

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- Definition The bond leverage ratio, per the indentures, at the end of the reporting period. + References No definition available. + Details
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- Definition Revolving credit and term leverage ratio at the end of the reporting period. + References No definition available. + Details
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- Definition Represents the entity's revolving credit and term loan fixed charge coverage ratio at the end of the reporting period. + References No definition available. + Details
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- Definition Represents the entity's revolving credit and term loan, net secured debt lease adjusted leverage ratio at the end of the reporting period. + References No definition available. + 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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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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