| **Incentive Plans and Stock-Based Compensation (Details 4) (USD $)In Thousands, except Share data, unless otherwise specified** | 3 Months Ended            |           |
|---------------------------------------------------------------------------------------------------------------------------------|---------------------------|-----------|
||
| **Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]**                     |                      |      |
| Options Outstanding - Number                                                                                                    | 3,188,165                 | 3,037,151 |
| Options Outstanding - Weighted Average Exercise Price                                                                           | $ 37.83                   | $ 36.09   |
| Options Outstanding - Intrinsic Value                                                                                           | $ 41,390                  |      |
| Options Outstanding - Weighted Average Remaining Life in Years                                                                  | 6 years 3 months 22 days  |      |
| Options Exercisable - Number                                                                                                    | 2,374,290                 |      |
| Options Exercisable - Weighted Average Exercise Price                                                                           | $ 35.27                   |      |
| Options Exercisable - Intrinsic Value                                                                                           | 34,389                    |      |
| Options Exercisable - Weighted Average Remaining Life in Years                                                                  | 4 years 8 months 12 days  |      |
| $20.57 - $28.79 [Member]                                                                                                        |                      |      |
| **Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]**                     |                      |      |
| Options Outstanding - Number                                                                                                    | 532,025                   |      |
| Options Outstanding - Weighted Average Exercise Price                                                                           | $ 26.75                   |      |
| Options Outstanding - Intrinsic Value                                                                                           | 12,800                    |      |
| Options Outstanding - Weighted Average Remaining Life in Years                                                                  | 2 years 7 months 10 days  |      |
| Options Exercisable - Number                                                                                                    | 532,025                   |      |
| Options Exercisable - Weighted Average Exercise Price                                                                           | $ 26.75                   |      |
| Options Exercisable - Intrinsic Value                                                                                           | 12,800                    |      |
| Options Exercisable - Weighted Average Remaining Life in Years                                                                  | 2 years 7 months 10 days  |      |
| $31.96 - $38.06 [Member]                                                                                                        |                      |      |
| **Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]**                     |                      |      |
| Options Outstanding - Number                                                                                                    | 1,321,065                 |      |
| Options Outstanding - Weighted Average Exercise Price                                                                           | $ 33.84                   |      |
| Options Outstanding - Intrinsic Value                                                                                           | 22,413                    |      |
| Options Outstanding - Weighted Average Remaining Life in Years                                                                  | 5 years 2 months 19 days  |      |
| Options Exercisable - Number                                                                                                    | 1,265,431                 |      |
| Options Exercisable - Weighted Average Exercise Price                                                                           | $ 33.91                   |      |
| Options Exercisable - Intrinsic Value                                                                                           | 18,961                    |      |
| Options Exercisable - Weighted Average Remaining Life in Years                                                                  | 4 years 5 months 12 days  |      |
| $40.73 - $49.91 [Member]                                                                                                        |                      |      |
| **Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]**                     |                      |      |
| Options Outstanding - Number                                                                                                    | 1,335,075                 |      |
| Options Outstanding - Weighted Average Exercise Price                                                                           | $ 46.18                   |      |
| Options Outstanding - Intrinsic Value                                                                                           | 6,177                     |      |
| Options Outstanding - Weighted Average Remaining Life in Years                                                                  | 8 years 10 months 13 days |      |
| Options Exercisable - Number                                                                                                    | 576,834                   |      |
| Options Exercisable - Weighted Average Exercise Price                                                                           | $ 46.13                   |      |
| Options Exercisable - Intrinsic Value                                                                                           | $ 2,628                   |      |
| Options Exercisable - Weighted Average Remaining Life in Years                                                                  | 7 years 2 months 5 days   |      |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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