Earnings per Share (Reconciliation Of Number Of Common Shares Used In Calculating Basic And Diluted EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Earnings per Share [Line Items]
Net income	$ 14,597	$ 16,921
Basic weighted-average shares outstanding	50,424,910	40,777,901
Diluted weighted-average shares outstanding	50,786,184	41,070,609
Basic net income per share	$ 0.29	$ 0.41
Diluted net income per share	$ 0.29	$ 0.41
Performance shares [Member]
Earnings per Share [Line Items]
Incremental shares	328,478	257,021
Restricted stock units [Member]
Earnings per Share [Line Items]
Incremental shares	32,796	35,687

Earnings per share.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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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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