| **Consolidated Statement Of Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands** | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income [Member] | Total       |
|----------------------------------------------------------------------------------------------|-----------------------|-----------------------------------------|----------------------------|-------------------------|-------------------------------------------------|-------------|
| Balance at Dec. 31, 2015                                                                     | $ 89,682              | $ 773,585                               | $ 930,061                  | $ (68,085)              | $ 687                                           | $ 1,725,930 |
| Net income                                                                                   |                  |                                    | 51,737                     |                    |                                            | 51,737      |
| Other comprehensive loss, net of income tax benefit of $34                                   |                  |                                    |                       |                    | (63)                                            | (63)        |
| Dividends                                                                                    |                  |                                    | (31,513)                   |                    |                                            | (31,513)    |
| Stock issued for acquisition (439,943 shares)                                                | 220                   | 12,625                                  |                       |                    |                                            | 12,845      |
| Sale of stock (11,373 shares)                                                                | 6                     | 326                                     |                       |                    |                                            | 332         |
| Repurchase of stock (91,102 shares)                                                          |                  |                                    |                       | (2,827)                 |                                            | (2,827)     |
| Equity compensation plan (217,725 shares)                                                    | 108                   | (108)                                   |                       |                    |                                            |        |
| Exercise of stock options (143,372 shares)                                                   | 72                    | 2,744                                   |                       |                    |                                            | 2,816       |
| Stock-based compensation                                                                     |                  | 806                                     | (127)                      |                    |                                            | 679         |
| Employee stock plan tax benefits                                                             |                  | 979                                     |                       |                    |                                            | 979         |
| Other                                                                                        |                  | (208)                                   |                       |                    |                                            | (208)       |
| Balance at Mar. 31, 2016                                                                     | $ 90,088              | $ 790,749                               | $ 950,158                  | $ (70,912)              | $ 624                                           | $ 1,760,707 |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of other increase (decrease) in additional paid in capital (APIC).
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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.
+ References
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).
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| - Definition
Value of stock issued pursuant to acquisitions during the period.
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
+ References
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| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
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| - Definition
Treasury Stock Reissued at Lower than Repurchase Price, Share-based Compensation
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