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Supplemental Condensed Consolidating Financial Information - Additional Information (Details) - USD ($) | Dec. 31, 2017 | Jun. 06, 2017
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5.375% Notes |  |
Condensed Financial Statements, Captions [Line Items] |  |
Percentage of contractual interest rate on Notes | 5.375% |
4.875% Notes |  |
Condensed Financial Statements, Captions [Line Items] |  |
Percentage of contractual interest rate on Notes | 4.875% |
Senior Notes | 5.375% Notes |  |
Condensed Financial Statements, Captions [Line Items] |  |
Percentage of contractual interest rate on Notes | 5.375% |
Senior Notes | 4.875% Notes |  |
Condensed Financial Statements, Captions [Line Items] |  |
Face amount of debt |  | $ 330,000,000
Percentage of contractual interest rate on Notes | 4.875% | 4.875%

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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