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Equity-based compensation Plan (Equity-Based Compensation Plan) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Number of options - Beginning of period	634,294	739,326	845,619
Number of options - Options granted	0	0	0
Number of options - Options exercises	(119,500)	(105,032)	(101,268)
Number of options - Options forfeited	(33,350)	0	(5,025)
Number of options - End of period	481,444	634,294	739,326
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward
Weighted Average Exercise Price - Beginning of period	$ 14.60	$ 14.28	$ 14.14
Weighted Average Exercise Price - Options granted	0	0	0
Weighted Average Exercise Price - Options exercises	12.36	12.32	13.41
Weighted Average Exercise Price - Options forfeited	15.42	0	17.08
Weighted Average Exercise Price - End of period	$ 15.10	$ 14.60	$ 14.28

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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)(1)(iv)(3)
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- Definition

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

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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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.

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

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

Number of share options (or share units) exercised during the current period.

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