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

No definition available.

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- Definition

Number of units exercisable in the period.

+ References

No definition available.

+ Details

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- Definition

Weighted average strike price of exercisable units.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Weighted average strike price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

No definition available.

+ Details

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- Definition

Weighted average grant-date fair value.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Total fair value of outstanding units, including vested and non-vested units.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Weighted average grant-date fair value.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted-average fair market value of both vested and non-vested outstanding units.

+ References

No definition available.

+ Details

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- Definition

Units, Shares [Roll Forward]

+ References

No definition available.

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- Definition

Units, Weighted Average Strike Price [Roll Forward]

+ References

No definition available.

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- Definition

Amount of increase (decrease) to additional paid-in capital (APIC) for recognition and exercise of award under share-based payment arrangement.

+ References

No definition available.

+ Details

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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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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Share-based compensation (Summary of Activity of Restricted Share Units) (Details) - Restricted Share Units - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
2011 Equity Incentive Plan
Units
Units, beginning balance (in shares)	1,605,049	1,736,845	1,780,997
Annual grant (in shares)	35,000	520,393	497,960
Partial vesting (in shares)			(361,284)
Forfeitures (in shares)	(239,621)	(117,600)	(180,828)
Units, ending balance (in shares)	937,839	1,605,049	1,736,845
Units, exercisable (in shares)	0
Weighted-average strike price
Units, beginning balance (in dollars per share)	$ 7.41	$ 6.65	$ 6.07
Annual grant (in dollars per share)	8.00	8.50	9.20
Partial vesting (in dollars per share)			7.65
Forfeitures (in dollars per share)	7.74	7.24	5.99
Units, ending balance (in dollars per share)	7.50	$ 7.41	$ 6.65
Units, exercisable (in dollars per share)	$ 0
Number of units outstanding	937,839
Weighted-average grant-date fair market value per unit (in dollars per share)	$ 7.50
Total grant-date fair value	$ 7,034
Weighted-average accumulated percentage of service	67.40%
Stock-based compensation recognized in Additional paid-in capital	$ 4,741
Compensation expense not yet recognized	$ 2,293
Weighted-average period for recognition	1 year 2 months 12 days
Partial Vesting
Units
Partial vesting (in shares)		(534,589)
Weighted-average strike price
Partial vesting (in dollars per share)		$ 6.01
2014 grant
Units
Partial vesting (in shares)	(38,222)
Weighted-average strike price
Partial vesting (in dollars per share)	$ 8.58
2015 grant
Units
Partial vesting (in shares)	(115,634)
Weighted-average strike price
Partial vesting (in dollars per share)	$ 6.33
2016 grant
Units
Partial vesting (in shares)	(134,501)
Weighted-average strike price
Partial vesting (in dollars per share)	$ 4.70
2017 grant
Units
Partial vesting (in shares)	(174,232)
Weighted-average strike price
Partial vesting (in dollars per share)	$ 9.20