| **Common Stock Restricted Stock - TIme Based Awards (Details) - USD ($) $ / shares in Units, $ in Thousands** | 12 Months Ended         |
|---------------------------------------------------------------------------------------------------------------|-------------------------|
||
| Restricted Stock [Member]                                                                                     |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                            |                    |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                             | three-year              |   |   |
| **Number of Shares**                                                                                          |                    |   |   |
| Outstanding beginning of year, January 1,                                                                     | 1,165,187               |   |   |
| Granted                                                                                                       | 363,395                 |   |   |
| Vested                                                                                                        | (581,343)               |   |   |
| Forfeited                                                                                                     | (50,728)                |   |   |
| Outstanding end of year, December 31,                                                                         | 896,511                 | 1,165,187 |   |
| **Weighted-Average Grant-Date Fair Value**                                                                    |                    |   |   |
| Outstanding at beginning of year, January 1,                                                                  | $ 25.33                 |   |   |
| Weighted-average grant date fair value per share                                                              | 70.01                   | $ 33.64 | $ 11.98 |
| Weighted average Vested                                                                                       | 26.15                   |   |   |
| Weighted average Forfeited                                                                                    | 40.58                   |   |   |
| Outstanding at end of year, December 31,                                                                      | 42.05                   | 25.33 |   |
| Weighted-average grant date fair value per share                                                              | $ 70.01                 | $ 33.64 | $ 11.98 |
| Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                        | $ 24,700                |   |   |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             | 1 year 3 months 18 days |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value      | $ 15,200                | $ 13,600 | $ 20,400 |
| Restricted Stock - Market Based Awards [Member]                                                               |                    |   |   |
| **Number of Shares**                                                                                          |                    |   |   |
| Outstanding beginning of year, January 1,                                                                     | 439,229                 |   |   |
| Granted                                                                                                       | 102,098                 |   |   |
| Vested                                                                                                        | (578,937)               |   |   |
| Outstanding end of year, December 31,                                                                         | 309,753                 | 439,229 |   |
| **Weighted-Average Grant-Date Fair Value**                                                                    |                    |   |   |
| Outstanding at beginning of year, January 1,                                                                  | $ 43.21                 |   |   |
| Weighted-average grant date fair value per share                                                              | 107.85                  | $ 54.01 | $ 33.52 |
| Weighted average Vested                                                                                       | 33.52                   |   |   |
| Outstanding at end of year, December 31,                                                                      | 71.76                   | 43.21 |   |
| Weighted-average grant date fair value per share                                                              | $ 107.85                | $ 54.01 | $ 33.52 |
| Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized                        | $ 11,600                |   |   |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             | 1 year 3 months 18 days |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value      | $ 19,400                | $ 11,600 | $ 4,700 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cost not yet recognized for nonvested award under share-based payment arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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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.
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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
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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| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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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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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of terms of award under share-based payment arrangement.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.
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| X                                                                                                                                           |
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| X                                                                                                                                                         |
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