STOCK BASED AND DEFERRED COMPENSATION - Summary of Compensation Expense and Stock Award Activity (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Summary of compensation expense and stock award activity | |||
| Stock-based compensation expense | $ 19,995 | $ 19,607 | $ 17,170 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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