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Stockholders' Equity (Information Relating to Option Grants and Exercises) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders' Equity
Weighted-average grant date fair value (in Dollars per share)	$ 8.00	$ 8.64	$ 7.62	$ 5.50
Intrinsic value of options exercised	$ 2,176	$ 1,687	$ 5,292	$ 8,661
Cash received	3,953	3,195	12,122	23,534
Total fair value of the options vested during the period	$ 112	$ 121	$ 8,162	$ 9,965

X

- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- Definition

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.

+ References

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-Publisher FASB
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-Section 50
-Paragraph 2
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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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