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Share-based compensation (Summary of Phantom RSU Award Activity) (Details) - Phantom RSU Award Plan - Phantom RSU Award $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Units
Grant (in shares)	1,672,657
Forfeitures (in shares)	(10,837)
Units, ending balance (in shares)	1,661,820
Number of units outstanding	1,661,820
Current share price (in dollars per share) | $ / shares	$ 8.10
Total fair value of the plan | $	$ 13,461
Weighted-average accumulated percentage of service	15.62%
Accrued liability | $	$ 2,102
Compensation expense not yet recognized | $	$ 11,359
Weighted-average period for recognition	3 years 11 months 19 days

X

- Definition

Compensation expense related to non-vested units that will be recognized in future awards.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

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- Definition

Fair value of outstanding units already vested related to stock options plan.

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- Definition

As of the balance sheet date, the number of vested unit related to stock options plan.

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No definition available.

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- Definition

As of the balance sheet date, the weighted-average fair market value of outstanding units that are fully vested.

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No definition available.

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- Definition

As of the balance sheet date weighted-average accumulated percentage of service rendered by employees for both vested and non-vested outstanding units.

+ References

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- Definition

Units, Shares [Roll Forward]

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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 (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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