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Share-based compensation - 2014 Plan PSUs (Details) - 2014 Plan $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Performance share units ("PSUs")
Number of shares
Non-vested at beginning of year (in shares)	111,564
Granted (in shares)	13,000
Retired (in shares)	(12,000)
Vested (in shares)	(58,500)
Non-vested at end of year (in shares)	54,064
Weighted average grant-date fair value
Non-vested at beginning of year (in dollars per share) | $ / shares	$ 5.76
Granted (in dollars per share) | $ / shares	4.99
Retired (in dollars per share) | $ / shares	5.76
Vested (in dollars per share) | $ / shares	5.76
Non-vested at end of year (in dollars per share) | $ / shares	$ 5.57
Other disclosure
Total fair value of shares that vested (in dollars) | $	$ 2.0
PSUs awarded but not yet earned
Number of shares
Non-vested at end of year (in shares)	437,060
Total non-vested and discretionary PSUs
Number of shares
Non-vested at end of year (in shares)	491,124

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

+ References

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)(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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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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).

+ References

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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).

+ References

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-Publisher FASB
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-Subparagraph (c)(2)(iii)(1)
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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.

+ References

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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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