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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator
Net income	$ 14,831	$ 13,142	$ 23,630	$ 21,125
Less: Undistributed earnings allocated to participating securities	(101)	(280)	(251)	(530)
Net income allocable to common stockholders	$ 14,730	$ 12,862	$ 23,379	$ 20,595
Denominator
Weighted average common shares outstanding - basic	22,146,124	20,649,910	21,814,860	20,628,598
Dilutive effect of restricted stock units	219,953	97,402	215,102	58,099
Weighted average common shares outstanding - diluted	22,366,077	20,747,312	22,029,962	20,686,697
Earnings per share:
Basic	$ 0.67	$ 0.62	$ 1.07	$ 1.00
Diluted	$ 0.66	$ 0.62	$ 1.06	$ 1.00

Incremental Common Shares Attributable To Restricted Stock Units Outstanding

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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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