| **Incentive Plans and Stock-Based Compensation (Details 1) (Employee and Non-Employee Stock Options [Member], USD $)In Thousands, except Per Share data, unless otherwise specified** | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| Employee and Non-Employee Stock Options [Member]                                                                                                                                      |           |           |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                                    |           |           |   |   |
| Pre-tax compensation expense                                                                                                                                                          | $ 775          | $ 1,089        | $ 2,436 | $ 4,307 |
| Deferred tax benefits                                                                                                                                                                 | (276)          | (400)          | (867) | (1,583) |
| Excess tax benefits associated with tax deductions over the amount of compensation expense recognized in the consolidated condensed financial statements                              | 3,119          | 119            | 6,018 | 2,606 |
| Fair value of stock options on date of grant                                                                                                                                          | 32             | 0              | 3,868 | 6,407 |
| Total intrinsic value of stock options exercised                                                                                                                                      | 11,417         | 614            | 20,297 | 8,360 |
| Cash received upon exercise of stock options                                                                                                                                          | 16,091         | 1,218          | 23,275 | 4,469 |
| Addition to capital in excess of par value due to exercise of stock options                                                                                                           | 18,707         | 1,293          | 27,520 | 5,352 |
| Unrecognized compensation cost related to share-based arrangements which the Company expects to recognize                                                                             | $ 6,162        |           | $ 6,162 |   |
| Weighted-average period in years, over which the Company expects to recognize compensation cost related to share-based arrangements                                                   |           |           | 2 years 6 months 26 days |   |
| **Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]**                                                              |           |           |   |   |
| Weighted average fair value per option at the date of grant for option granted                                                                                                        |           |           | $ 9.98 | $ 12.49 |
| Risk-free interest rate                                                                                                                                                               |           |           | 1.19% | 1.38% |
| Expected dividend yield                                                                                                                                                               |           |           | 1.19% | 0.96% |
| Expected volatility factor                                                                                                                                                            |           |           | 25.80% | 26.52% |
| Expected option term in years                                                                                                                                                         |           |           | 5 years 4 months 24 days | 6 years 1 month 6 days |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
+ References
No definition available.
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| - Definition
Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares).
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No definition available.
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| - Definition
Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.
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| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
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| - Definition
Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.
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| - Definition
Unrecognized cost of unvested share-based compensation awards.
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| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.
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| - Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
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| - Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
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| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
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| - Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
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| - Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
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