| **Schedule of Changes in Restricted Stock - Market Based Awards (Details) (USD $)**                                             | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|---------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| **Share-based Compensation Arrangement by Share-based Payment Award**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                                               | The SARs vest ratably over a three-year period and may be exercised at any point after vesting through 10 years from the date of issuance. Pursuant to the terms of the awards, upon exercise, the executive officers will receive, in shares of common stock, the excess of the market price of the award on the date of exercise over the market price of the award on the date of issuance.                                                                                                                            |   |
| Restricted Stock - Market Based Awards                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |
| **Share-based Compensation Arrangement by Share-based Payment Award**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                                               | The fair value of the market-based restricted shares is amortized ratably over the requisite service period, primarily three years. The market-based shares vest if the participant is continuously employed throughout the performance period and the market-based performance measure is achieved, with a maximum vesting period of five years. All compensation cost related to the market-based awards will be recognized if the requisite service period is fulfilled, even if the market condition is not achieved. |   |
| Time based shares granted to executives                                                                                         | 42,151                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |
| **Number of Shares**                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |
| Outstanding beginning of year, January 1,                                                                                       | 72,111                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |
| Granted                                                                                                                         | 42,151                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |
| Outstanding at March 31,                                                                                                        | 114,262                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |
| **Weighted-Average Grant-Date Fair Value**                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |
| Outstanding at beginning of year, January 1,                                                                                    | $ 43.75                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |
| Weighted-average grant date fair value per share                                                                                | $ 56.87                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ 49.04 |
| Outstanding at March 31,                                                                                                        | $ 48.59                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |
| Total intrinsic value of time based awards vested                                                                               | $ 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ 0 |
| Total intrinsic value of market-based awards non-vested                                                                         | 7,114,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 4,078,000 |
| Market price per common share as of March 31,                                                                                   | $ 62.26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ 49.57 |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                         | $ 3,500,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 2 years 2 months 29 days                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The intrinsic value of equity-based payment equity instruments, excluding stock (or unit) options, that are not vested as of period end as calculated by applying the disclosed pricing methodology.
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| X                                                                                                                                                                                                                                                           |
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| - Definition
Time based shares granted to executives
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| X                                                                                                                                                                                                                                                                                  |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
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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 weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net number of non-option equity instruments granted to participants.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of equity instruments other than options outstanding, including both vested and non-vested instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| - Definition
Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.
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| - Definition
Price of a single share of a number of saleable stocks of a company.
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