Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income	$ 13,142	$ 9,798	$ 21,125	$ 16,149
Less: Undistributed earnings allocated to participating securities	(280)	(361)	(530)	(533)
Net income allocable to common stockholders	$ 12,862	$ 9,437	$ 20,595	$ 15,616
Denominator
Weighted average common shares outstanding - basic	20,649,910	20,556,536	20,628,598	20,533,237
Dilutive effect of restricted stock units	97,402		58,099
Weighted average common shares outstanding - diluted	20,747,312	20,556,536	20,686,697	20,533,237
Earnings per share:
Basic	$ 0.62	$ 0.46	$ 1.00	$ 0.76
Diluted	$ 0.62	$ 0.46	$ 1.00	$ 0.76

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Net Income (Loss) Available to Common Stockholders, Basic and diluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class 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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