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Supplemental Condensed Consolidating Financial Information - Additional Information (Details) - USD ($)	Dec. 31, 2017	Jun. 06, 2017
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%

X

- 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.

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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

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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

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