Earnings Per Share (Schedule of Weighted Average Number of Shares for Calculating Diluted Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Common and Potential Common Shares Outstanding for Diluted Earnings per Share
Weighted average common shares outstanding	30,933	30,933
Common shares outstanding for diluted earnings per share	31,008	31,008
Unvested Restricted Stock Units [Member]
Common and Potential Common Shares Outstanding for Diluted Earnings per Share
Potential common shares outstanding for diluted earnings per share	75	75

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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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 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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