| **Schedule of Changes in SARs (Details) - USD ($) $ / shares in Units, $ in Thousands**                                         | 6 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 ten 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. |   |
| Stock Appreciation Rights (SARs)                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                            |   |
| **Number of SARs**                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                            |   |
| Outstanding beginning of year, January 1,                                                                                       | 279,011                                                                                                                                                                                                                                                                                                                                                                                         | 190,763 |
| Awarded                                                                                                                         | 68,274                                                                                                                                                                                                                                                                                                                                                                                          | 88,248 |
| Outstanding at June 30,                                                                                                         | 347,285                                                                                                                                                                                                                                                                                                                                                                                         | 279,011 |
| Vested and expected to vest at June 30,                                                                                         | 339,980                                                                                                                                                                                                                                                                                                                                                                                         | 268,453 |
| Exercisable at June 30,                                                                                                         | 191,149                                                                                                                                                                                                                                                                                                                                                                                         | 109,920 |
| **Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price**    |                                                                                                                                                                                                                                                                                                                                                                                            |   |
| Outstanding beginning of year, January 1,                                                                                       | $ 38.77                                                                                                                                                                                                                                                                                                                                                                                         | $ 33.77 |
| Awarded                                                                                                                         | 39.63                                                                                                                                                                                                                                                                                                                                                                                           | 49.57 |
| Outstanding at June 30,                                                                                                         | 38.94                                                                                                                                                                                                                                                                                                                                                                                           | 38.77 |
| Vested and expected to vest at June 30,                                                                                         | 38.88                                                                                                                                                                                                                                                                                                                                                                                           | 38.53 |
| Exercisable at June 30,                                                                                                         | $ 35.68                                                                                                                                                                                                                                                                                                                                                                                         | $ 32.71 |
| **Weighted-Average Remaining Contractual Term (in years)**                                                                      |                                                                                                                                                                                                                                                                                                                                                                                            |   |
| SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2             | 7 years 9 months                                                                                                                                                                                                                                                                                                                                                                                | 8 years 3 months 20 days |
| SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2             | 7 years 9 months                                                                                                                                                                                                                                                                                                                                                                                | 8 years 3 months 20 days |
| Vested and expected to vest at June 30,                                                                                         | 7 years 8 months 20 days                                                                                                                                                                                                                                                                                                                                                                        | 8 years 3 months 20 days |
| Exercisable at June 30,                                                                                                         | 6 years 10 months 17 days                                                                                                                                                                                                                                                                                                                                                                       | 7 years 3 months 16 days |
| **Share based compesation aggregate intrinsic value**                                                                           |                                                                                                                                                                                                                                                                                                                                                                                            |   |
| Outstanding beginning of year, January 1,                                                                                       | $ 5,107                                                                                                                                                                                                                                                                                                                                                                                         | $ 6,803 |
| Outstanding at June 30,                                                                                                         | 5,107                                                                                                                                                                                                                                                                                                                                                                                           | 6,803 |
| Vested and expected to vest at June 30,                                                                                         | 5,019                                                                                                                                                                                                                                                                                                                                                                                           | 6,609 |
| Exercisable at June 30,                                                                                                         | 3,433                                                                                                                                                                                                                                                                                                                                                                                           | $ 3,346 |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                         | $ 2,800                                                                                                                                                                                                                                                                                                                                                                                         |   |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 1 year 9 months 18 days                                                                                                                                                                                                                                                                                                                                                                         |   |

| X                                                                                                                                                                                                                                                                                                             |
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Vested and expected to vest, remaining contractual term
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| - Definition
Unrecognized cost of unvested share-based compensation awards.
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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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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
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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| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.
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| - 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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| - 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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| - 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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| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.
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| - Definition
As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.
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| - Definition
As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.
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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.
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| - 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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