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Incentive Plan - Summary of Fair Value of Stock Options Granted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Risk-free interest rate	1.03%	2.63%
Expected option life	7 years	7 years
Expected volatility	23.00%	21.00%
Expected dividend yield	3.33%	2.70%
Weighted average fair value of an option share granted during the year (in dollars per share)	$ 2.93	$ 4.47
Intrinsic value of options exercised during the year (in shares)	$ 2,499	$ 2,994

X

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Estimated Fair Value Of Options Granted

+ References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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-Publisher FASB
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-Topic 718
-SubTopic 10
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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