Earnings per Share (Schedule of Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Income from continuing operations	$ 14,357	$ 24,476	$ 19,913	$ 6,345	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 65,091	$ 63,809	$ 62,965
Loss from discontinued operations									0	0	(405)
Net income	$ 14,357	$ 24,476	$ 19,913	$ 6,345	$ 13,117	$ 19,503	$ 22,837	$ 8,352	$ 65,091	$ 63,809	$ 62,560
Weighted average shares outstanding (in shares)									32,389	31,979	31,701
Common stock options and restricted stock (in shares)									333	555	549
Weighted average shares and conversions (in shares)									32,722	32,534	32,250

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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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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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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