| **Schedule of Changes in Restricted Stock - TIme Based Awards (Details) (USD $)**                                               | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **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                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                           |   |
| **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 time-based restricted shares is amortized ratably over the requisite service period, primarily three years. The time-based shares vest ratably on each annual anniversary following the grant date if the participant is continuously employed.                                                                                                                          |   |
| Time based shares granted to executives                                                                                         | 120,428                                                                                                                                                                                                                                                                                                                                                                                        |   |
| **Number of Shares**                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                           |   |
| Outstanding beginning of year, January 1,                                                                                       | 651,781                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Granted                                                                                                                         | 126,102                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Vested                                                                                                                          | (84,235)                                                                                                                                                                                                                                                                                                                                                                                       |   |
| Forfeited                                                                                                                       | (15,466)                                                                                                                                                                                                                                                                                                                                                                                       |   |
| Outstanding at March 31,                                                                                                        | 678,182                                                                                                                                                                                                                                                                                                                                                                                        |   |
| **Weighted-Average Grant-Date Fair Value**                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                           |   |
| Outstanding at beginning of year, January 1,                                                                                    | $ 36.36                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Weighted-average grant date fair value per share                                                                                | $ 49.62                                                                                                                                                                                                                                                                                                                                                                                        | $ 36.82 |
| Vested                                                                                                                          | $ 35.09                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Forfeited                                                                                                                       | $ 36.59                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Outstanding at March 31,                                                                                                        | $ 38.98                                                                                                                                                                                                                                                                                                                                                                                        |   |
| Total intrinsic value of time based awards vested                                                                               | $ 4,317,000                                                                                                                                                                                                                                                                                                                                                                                    | $ 2,303,000 |
| Total intrinsic value of time-based awards non-vested                                                                           | 42,224,000                                                                                                                                                                                                                                                                                                                                                                                     | 34,572,000 |
| 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                         | $ 18,500,000                                                                                                                                                                                                                                                                                                                                                                                   |   |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 2 years 0 months 30 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.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Time based shares granted to executives
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| X                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - 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.
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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.
+ References
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| - Definition
Price of a single share of a number of saleable stocks of a company.
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