| **Common Stock COMMON STOCK Restricted Stock - Market Based Awards (Details) - USD ($) $ / shares in Units, $ in Thousands**                                       | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |         |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
||
| Minimum [Member]                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| Performance Shares Payout Range                                                                                                                                    | 0.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |    |   |
| Maximum [Member]                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| Performance Shares Payout Range                                                                                                                                    | 200.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    |   |
| Restricted Stock - Market Based Awards [Member]                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |    |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                                                                                  | The fair value of the market-based PSUs 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 three 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. |    |   |
| Market based performance shares granted to executives                                                                                                              | 139,197                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                                                           | 3 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 3 years |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                                                 | 2.50%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 2.40%   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                                                | 41.40%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 42.30%  |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number                                              | 242,111                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    | 102,914 |
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted                                                          | 139,197                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value        | $ 64.42                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    | $ 74.88 |
| Aggregate intrinsic value of non-vested awards                                                                                                                     | $ 8,731                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ 8,402 |   |
| Share Price                                                                                                                                                        | $ 36.06                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ 60.45 |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 56.68                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | $ 69.98 |   |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount                                                                                  | $ 10,300                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |    |   |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                                                                  | 2 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |    |   |

| 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                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Market based performance shares granted to executives
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Performance Shares Payout Range
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| - Definition
Amount of cost not yet recognized for nonvested award under share-based payment arrangement.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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
Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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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 terms of award under share-based payment arrangement.
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| - Definition
Price of a single share of a number of saleable stocks of a company.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
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