Deferred compensation (Restricted Stock Unit Plan) (Details) - $ / shares	Sep. 30, 2017	Jan. 01, 2017
Stock-Based Compensation [Line Items]
Estimated fair value per share at end of period ($ per share)	$ 23.25
Restricted Stock Unit Plan \| Restricted Stock Units (RSU) \| Predecessor
Stock-Based Compensation [Line Items]
Unvested and outstanding restricted stock units		98,596
Weighted average grant date fair value of per unit of unvested and outstanding restricted stock units		$ 7.18
Estimated fair value per share at end of period ($ per share)		$ 0.00

Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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