| **COMMON STOCK Schedule of Changes in SARs (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands** | 12 Months Ended           |                         |         |         |         |
|--------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------|-------------------------|---------|---------|---------|
||
| **Number of SARs**                                                                                                                               |                      |                    |    |    |    |   |   |
| Outstanding beginning of year, January 1,                                                                                                        | 326,453                   | 279,011                 | 190,763 |    |    |   |   |
| Awarded                                                                                                                                          | 58,709                    | 68,274                  | 88,248  |    |    |   |   |
| Exercised                                                                                                                                        | (141,084)                 | (20,832)                | 0       |    |    |   |   |
| Outstanding end of year, December 31,                                                                                                            | 244,078                   | 326,453                 | 279,011 |    |    |   |   |
| Exercisable at December 31,                                                                                                                      |                      |                    |    | 174,919 | 222,489 | 139,334 |   |
| **Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]**      |                      |                    |    |    |    |   |   |
| Outstanding beginning of year, January 1,                                                                                                        | $ 38.99                   | $ 38.77                 | $ 33.77 |    |    |   |   |
| Awarded                                                                                                                                          | 51.63                     | 39.63                   | 49.57   |    |    |   |   |
| Exercised                                                                                                                                        | 40.16                     | 38.05                   | 0       |    |    |   |   |
| Outstanding end of year, December 31,                                                                                                            | $ 41.36                   | $ 38.99                 | $ 38.77 |    |    |   |   |
| Exercisable at December 31,                                                                                                                      |                      |                    |    | $ 38.72 | $ 37.70 | $ 36.27 |   |
| **Weighted-Average Remaining Contractual Term (in years)**                                                                                       |                      |                    |    |    |    |   |   |
| Outstanding at December 31,                                                                                                                      | 6 years 10 months 19 days | 7 years 3 months 6 days |    |    |    |   |   |
| Exercisable at December 31,                                                                                                                      | 6 years 3 months 10 days  |                    |    |    |    |   |   |
| **Share based compesation aggregate intrinsic valu [Roll Forward]**                                                                              |                      |                    |    |    |    |   |   |
| Outstanding beginning of year, January 1,                                                                                                        | $ 7,620                   | $ 4,697                 | $ 1,472 | $ 7,620 | $ 4,697 | $ 1,472 | $ 3,711 |
| Awarded                                                                                                                                          | 0                         | 0                       | 0       |    |    |   |   |
| Exercised                                                                                                                                        | 2,770                     | 473                     | 0       |    |    |   |   |
| Outstanding end of year, December 31,                                                                                                            | $ 7,620                   | $ 4,697                 | $ 1,472 |    |    |   |   |
| Exercisable at December 31,                                                                                                                      |                      |                    |    | 5,924   | $ 3,489 | $ 982 |   |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                                          |                      |                    |    | $ 1,500 |    |   |   |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                  | 1 year 8 months 22 days   |                    |    |    |    |   |   |

| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share based compensation remaining contractual term [Roll Forward]
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Share based compesation aggregate intrinsic valu [Roll Forward]
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| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Intrinsic value of share based awards exercised during the period
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| X                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Intrinsic value of share based awards granted during the period
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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
Number of non-option equity instruments exercised by participants.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net number of non-option equity instruments granted to participants.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of equity instruments other than options outstanding, including both vested and non-vested instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.
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| - Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.
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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.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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