Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 34,054	$ 29,902	$ 63,244	$ 37,564
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share	32,299	32,257	32,286	32,239
Effect of dilutive stock-based compensation plans:
Stock options	12	16	12	16
Weighted average number of shares used in calculating diluted net income per share	32,311	32,273	32,298	32,255
Average market price of common stock used for calculation of dilutive shares	$ 74.86	$ 61.86	$ 73.08	$ 62.83
Net income attributable to the Company per share:
Basic	1.05	0.93	1.96	1.17
Diluted	$ 1.05	$ 0.93	$ 1.96	$ 1.16

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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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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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