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OTHER LONG-TERM LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Liabilities, Noncurrent [Abstract] |
Other Noncurrent Liabilities [Table Text Block] | The components of Other long-term liabilities as of June 30, 2021 and December 31, 2020 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | June 30, 2021 |  | December 31, 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred revenue | ​ | ​ | $ | 22,123 |  | $ | 17,434 | ​
Deferred compensation plan | ​ | ​ | ​ | 27,826 | ​ | ​ | 23,858 | ​
Deferred social security taxes | ​ | ​ | ​ | 16,983 | ​ | ​ | 15,986 | ​
Other | ​ | ​ |  | 29,469 | ​ |  | 38,907 | ​
Total | ​ | ​ | $ | 96,401 |  | $ | 96,185 | ​

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details
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