Share-based compensation - Summary of Restricted Stock and Performance Share Awards (Details)	6 Months Ended
Jun. 30, 2020 $ / shares shares
Restricted Share Awards
Number of Shares
Unvested balance at beginning of period (in shares) \| shares	2,157,336
Granted (in shares) \| shares	1,076,619
Vested (in shares) \| shares	(838,553)
Forfeited (in shares) \| shares	(68,409)
Unvested balance at end of period (in shares) \| shares	2,326,993
Weighted-Average Grant Date Fair Value
Unvested balance at beginning of period (in dollars per share) \| $ / shares	$ 9.03
Granted (in dollars per share) \| $ / shares	7.92
Vested (in dollars per share) \| $ / shares	8.97
Forfeited (in dollars per share) \| $ / shares	8.95
Unvested balance at end of period (in dollars per share) \| $ / shares	$ 8.54
Performance Share Awards
Number of Shares
Unvested balance at beginning of period (in shares) \| shares	913,407
Granted (in shares) \| shares	552,395
Forfeited (in shares) \| shares	(265,088)
Unvested balance at end of period (in shares) \| shares	1,200,714
Weighted-Average Grant Date Fair Value
Unvested balance at beginning of period (in dollars per share) \| $ / shares	$ 7.22
Granted (in dollars per share) \| $ / shares	6.38
Forfeited (in dollars per share) \| $ / shares	7.99
Unvested balance at end of period (in dollars per share) \| $ / shares	$ 6.66

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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