Earnings Per Common Share Computations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Earnings from continuing operations	$ 46,357	$ 55,033	$ 58,152
Earnings from continuing operations allocated to participating securities	(267)	(873)	(518)
Numerator for basic earnings from continuing operations per common share	46,090	54,160	57,634
Net earnings	46,357us-gaap_NetIncomeLoss	54,900us-gaap_NetIncomeLoss	58,276us-gaap_NetIncomeLoss
Net earnings allocated to participating securities	(267)us-gaap_DistributedEarnings	(870)us-gaap_DistributedEarnings	(519)us-gaap_DistributedEarnings
Numerator for basic net earnings per common share	$ 46,090	$ 54,030	$ 57,757
Earnings Per Share, Basic and Diluted [Abstract]
Basic	17,271	17,294	17,047
Plus dilutive effect of stock options (in shares)	153	248	233
Plus dilutive effect of participating securities (in shares)	165	396	195
Diluted (in shares)	17,589	17,938	17,475
Earnings Per Share, Basic [Abstract]
Earnings from continuing operations	$ 2.67	$ 3.13	$ 3.38
Discontinued operations	$ 0.00	$ (0.01)	$ 0.01
Net earnings (per basic share)	$ 2.67us-gaap_EarningsPerShareBasic	$ 3.12us-gaap_EarningsPerShareBasic	$ 3.39us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract]
Earnings from continuing operations	$ 2.64	$ 3.07	$ 3.33
Discontinued operations	$ 0.00	$ (0.01)	$ 0.01
Net earnings (per share, diluted)	$ 2.64us-gaap_EarningsPerShareDiluted	$ 3.06us-gaap_EarningsPerShareDiluted	$ 3.34us-gaap_EarningsPerShareDiluted

Income (Loss) from Continuing Operations, Basic

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Incremental Common Shares Attributable To Participating Securities

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Participating Securities, Distributed and Undistributed Earnings, Continuing Operations

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during 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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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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