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Fair value measurement - LTIP Investments Carried at Fair Value by Category on Condensed Consolidated and Combined Balance Sheets in Accordance with Valuation Hierarchy (Details) - Fair Value Recurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Total investments at fair value	$ 2,293	$ 3,259
Mutual Funds
Assets:
Fair value measurements, Assets	1,687	2,228
Fixed Income Fund
Assets:
Fair value measurements, Assets	606	1,031
Level 1 | Mutual Funds
Assets:
Fair value measurements, Assets	$ 1,687	$ 2,228

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841

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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

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