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6. Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per share:
Weighted average number of common shares outstanding during the period used to compute basic earnings per share	22,526	22,636	22,378	21,800
Incremental common shares attibutable to exercise of outstanding options and warrants	1,540	2,099	1,724	3,378
Weighted average number of common shares used to compute diluted earnings per share	24,066	24,735	24,102	25,178

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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