v3.8.0.1

Summary of Significant Accounting Policies - TPG Investment in Company (Details) - TPG Management - USD ($) $ in Millions		12 Months Ended
	Jun. 19, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
TPG Investment in Company
Ownership percentage (percent)		43.70%
Management Services Agreement
TPG Investment in Company
Monitoring fee (up to)	$ 0.5
TPG ownership percentage (at least)	30.00%
Payments for Fees		$ 0.4	$ 0.4	$ 0.4

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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