Earnings Per Share (Schedule Computing Earnings Per Share and Weighted Average Number of Shares) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 12,213	$ 10,621
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share	31,882	31,786
Effect of dilutive stock-based compensation plans:
Stock options	90	106
Weighted average number of shares used in calculating diluted net income per share	31,972	31,892
Average market price of common stock used for calculation of dilutive shares	$ 37.36	$ 35.68
Earnings per share attributable to Company shareholders:
Basic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic
Diluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted

Average market price of common stock used for calculation of dilutive shares.

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Incremental Common Shares Attributable To Stock Options.

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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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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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