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Investment in Equity Securities - Additional Information (Details) - Investee - USD ($) shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2017	Apr. 14, 2017
Schedule Of Cost Method Investments [Line Items]
Amount invested in minority equity investment		$ 2.9
Preferred stock received in minority equity investment, shares		4.7
Percentage of outstanding voting securities on a fully diluted basis		15.00%
Investment in equity securities, additional information	There have been no identified events or changes in circumstances that may have a significant adverse effect on the fair value of the investment.

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Additional narrative disclosure about the investment, including any descriptions that are not captured by other line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Original amount of cost-method investments at the acquisition date.

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Balance held at close of period in number of shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column B)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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-Name Accounting Standards Codification
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-Section 50
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