| **Incentive Plans and Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)** | 12 Months Ended                                                                                                                                                                                        |
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| **Stock Option Activity in Shares**                                                                   |                                                                                                                                                                                                   |   |   |
| Outstanding at end of year                                                                            | 2,310,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber                                                                                                     |   |   |
| Exercisable at end of year                                                                            | 1,409,359us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber                                                                                                     |   |   |
| **Weighted Average Exercise Prices**                                                                  |                                                                                                                                                                                                   |   |   |
| Weighted Average Exercise Price - Outstanding End of Period (in dollars per share)                    | $ 45.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice                                                                                 |   |   |
| Weighted Average Exercise Price - Exercisable (in dollars per share)                                  | $ 40.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice                                                                                 |   |   |
| Stock Options [Member]                                                                                |                                                                                                                                                                                                   |   |   |
| **Stock Option Activity in Shares**                                                                   |                                                                                                                                                                                                   |   |   |
| Outstanding at beginning of year                                                                      | 2,208,314us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                                           | 3,037,151us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | 2,907,533us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Granted                                                                                               | 450,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                                           | 387,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | 512,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Exercised                                                                                             | (322,473)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                                                                          | (1,191,752)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | (353,793)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Surrendered                                                                                           | (25,821)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                            | (24,585)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | (29,439)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Outstanding at end of year                                                                            | 2,310,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                                           | 2,208,314us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | 3,037,151us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Exercisable at end of year                                                                            | 1,409,359us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                                           | 1,413,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | 2,035,267us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| **Weighted Average Exercise Prices**                                                                  |                                                                                                                                                                                                   |   |   |
| Weighted Average Exercise Price - Outstanding Beginning of Year (in dollars per share)                | $ 40.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                       | $ 36.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 32.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Weighted Average Exercise Price - Granted (in dollars per share)                                      | $ 61.49us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                   | $ 45.25us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 49.84us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Weighted Average Exercise Price - Exercised (in dollars per share)                                    | $ 33.30us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                | $ 30.30us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 25.28us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Weighted Average Exercise Price - Surrendered (in dollars per share)                                  | $ 52.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 42.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 40.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Weighted Average Exercise Price - Outstanding End of Period (in dollars per share)                    | $ 45.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                       | $ 40.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 36.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |
| Weighted Average Exercise Price - Exercisable (in dollars per share)                                  | $ 40.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember                       | $ 38.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember | $ 32.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_EmployeeStockOptionMember |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| - Definition
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price of options that were either forfeited or expired.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| - Definition
Gross number of share options (or share units) granted during the period.
+ References
No definition available.
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| - Definition
Number of options outstanding, including both vested and non-vested options.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.
+ References
No definition available.
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| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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