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OVERVIEW AND BASIS OF PRESENTATION (Tables) | 12 Months Ended
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Dec. 31, 2021
OVERVIEW AND BASIS OF PRESENTATION [Abstract] |
Restrictions on Cash and Cash Equivalents [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the Consolidated Balance Sheets that sum to the amounts reported in the Consolidated Statement of Cash Flows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, 2021 |  | December 31, 2020 |  | December 31, 2019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | ​ | $ | 158,205 |  | $ | 132,914 |  | $ | 82,407 | ​
Restricted cash included in "Prepaid and other current assets" | ​ | ​ |  | 22,477 | ​ |  | 26,101 | ​ |  | 23,172 | ​
Restricted cash included in "Other noncurrent assets" | ​ | ​ |  | — | ​ |  | — | ​ |  | 12 | ​
Total | ​ | ​ | $ | 180,682 |  | $ | 159,015 |  | $ | 105,591 | ​
Schedule of property, plant and equipment useful lives | Depreciation and amortization are computed on the straight-line method based on the following estimated useful lives:
​ | ​ | ​
Building |  | 30 years
Computer equipment and software |  | 3 to 7 years
Telephone equipment |  | 4 to 7 years
Furniture and fixtures |  | 5 years
Leasehold improvements |  | Lesser of economic useful life (typically 10 years) or original lease term
Other |  | 3 to 7 years

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