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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income	$ 15,495	$ 33,193	$ 32,612	$ 53,212
Less: Undistributed earnings allocated to participating securities		(3)		(67)
Net income allocable to common stockholders	$ 15,495	$ 33,190	$ 32,612	$ 53,145
Denominator
Weighted average common shares outstanding - basic	30,341,628	29,901,791	30,272,818	29,709,728
Dilutive effect of restricted stock units	227,220	268,898	234,127	293,548
Weighted average common shares outstanding - diluted	30,568,848	30,170,689	30,506,945	30,003,276
Earnings per share:
Basic	$ 0.51	$ 1.11	$ 1.08	$ 1.79
Diluted	$ 0.51	$ 1.10	$ 1.07	$ 1.77

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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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