Equity - Restricted Stock and performance-based stock units (Details) - shares	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Restricted stock and performance-based stock units
Restricted stock and performance based stock units activity
Granted (in shares)	182,240	167,375
Performance-based stock units
Restricted stock and performance based stock units activity
Granted (in shares)	71,892	66,027
Vested (in shares)	(108,720)	(81,574)
Outstanding at the end of the period (in shares)	0
Restricted stock
Restricted stock and performance based stock units activity
Outstanding at the beginning of the period (in shares)	180,440	163,569
Granted (in shares)	110,348	101,348
Vested (in shares)	(93,366)	(84,477)
Outstanding at the end of the period (in shares)	197,422	180,440

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).

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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

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)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

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- Definition

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

+ 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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