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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION- Schedule of Other Non-current Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] |  |  |
Deferred income tax | $ 11,593 | $ 4,829 |
Debt issue costs, net | 1,852 | 2,156 |
Deferred contract acquisition costs | 5,315 | 10,133 |
Deferred cloud implementation costs | 10,402 | 7,372 |
Other | 5,165 | 4,115 |
Other non-current assets | 34,327 | 28,605 |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Long-lived asset impairment | 22,351 | $ 0 | $ 0
Other Non-Current Assets |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Long-lived asset impairment | $ 900 |  |

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