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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2023 USD ($) subsidiary shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies |  |  |  |
Number of wholly-owned subsidiaries | subsidiary | 63 |  |  |
Other comprehensive income (loss), net of tax | $ 518,000 | $ (798,000) | $ 0 |
Accounts receivable, net | 628,700,000 | 585,500,000 |  |
Accounts receivable, allowance for losses | $ 22,829,000 | 14,761,000 | 12,086,000 |
Sales commission, renewal period (in years) | 1 year |  |  |
Research and development expense | $ 109,585,000 | 105,184,000 | 93,481,000 |
Goodwill | 2,532,109,000 | 2,489,308,000 | 2,359,674,000 |
Impairments of intangible assets | 0 | 0 | 0 |
Impairments of long-lived assets | 0 | 0 | 0 |
Capitalized post acquisition software development costs | 32,500,000 | 27,600,000 | 21,700,000 |
Cash and cash equivalents | 165,493,000 | 173,857,000 | $ 309,171,000 | $ 603,623,000
Case Management, Business Process Management, Data And Insight |  |  |  |
Accounting Policies |  |  |  |
Goodwill | $ 1,700,000,000 |  |  |
Percentage of total goodwill | 67.00% |  |  |
Stock Option Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation contractual term (in years) | 10 years |  |  |
Stock Option Plan | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation contractual term (in years) | 10 years |  |  |
Performance Shares | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share conversion rate (in shares) | shares | 1 |  |  |
Unbilled Revenues |  |  |  |
Accounting Policies |  |  |  |
Accounts receivable, net | $ 119,200,000 | 135,400,000 |  |
Unbilled Revenues | Retention Receivable |  |  |  |
Accounting Policies |  |  |  |
Accounts receivable, net | $ 9,800,000 | $ 8,600,000 |  |
Minimum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 1 year |  |  |
Typical contract term (in years) | 3 years |  |  |
Progress billing retention percentage | 5.00% |  |  |
Payment term | 30 days |  |  |
Sales commissions amortization period (in years) | 3 years |  |  |
Minimum | Software and Software Development Costs |  |  |  |
Accounting Policies |  |  |  |
Remaining estimated economic life (in years) | 3 years |  |  |
Minimum | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 3 years |  |  |
Minimum | Stock Option Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 3 years |  |  |
Minimum | Restricted Stock Units (RSUs) | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 3 years |  |  |
Minimum | Performance Shares | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 1 year |  |  |
Maximum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 10 years |  |  |
Typical contract term (in years) | 5 years |  |  |
Progress billing retention percentage | 15.00% |  |  |
Payment term | 90 days |  |  |
Sales commissions amortization period (in years) | 7 years |  |  |
Maximum | Software and Software Development Costs |  |  |  |
Accounting Policies |  |  |  |
Remaining estimated economic life (in years) | 5 years |  |  |
Maximum | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 5 years |  |  |
Maximum | Stock Option Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 5 years |  |  |
Maximum | Restricted Stock Units (RSUs) | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 5 years |  |  |
Maximum | Performance Shares | 2018 Plan |  |  |  |
Accounting Policies |  |  |  |
Share based compensation vesting period (in years) | 3 years |  |  |
SaaS arrangements services | Minimum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 1 year |  |  |
Typical contract term (in years) | 3 years |  |  |
SaaS arrangements services | Maximum |  |  |  |
Accounting Policies |  |  |  |
Contract term (in years) | 10 years |  |  |
Typical contract term (in years) | 5 years |  |  |

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