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FAIR VALUE MEASUREMENTS (goodwill and non-recurring asset impairment analyses) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) reporting_units | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 reporting_units | Sep. 30, 2020 USD ($) reporting_units | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) reporting_units | Dec. 31, 2021 USD ($) reporting_units | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2017 USD ($)
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 0 | $ 0 |  | $ 0 | $ 71,449 | $ 387,851 |  |  |  | $ 71,449 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 1,430,141 |  | $ 1,430,141 | 702,958 | $ 774,377 |  |  |  |
Total asset impairment charges |  |  |  |  |  |  |  |  |  |  | 0 | 101,749 | 421,090 |  |  |  |
Reportable business segments [Member] | Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_units |  |  |  |  | 1 |  |  |  | 4 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 895,338 |  | 895,338 | 168,165 | 168,165 |  |  |  |
Reportable business segments [Member] | Promotional Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | 67,132 |  |  |  |  |
Number of reporting units | reporting_units |  |  |  |  | 1 |  |  |  | 2 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 59,175 |  | $ 59,175 | $ 59,165 | $ 126,267 |  |  |  |
Nonrecurring [Member] | Assets held for sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  | $ 7,514 |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  | 11,210 |  |  |  | 11,210 |  |  |  |  |  |  |
Nonrecurring [Member] | Customer lists/relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  | $ 1,923 |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Nonrecurring [Member] | Customer lists/relationships [Member] | Small business distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 2,356 | 2,752 |  |  | 5,108 |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  | $ 4,479 |  |  |  | $ 4,479 |  |  |  |  |  |  |
Nonrecurring [Member] | Measurement input, revenue growth rate [Member] | Customer lists/relationships [Member] | Small business distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  |  |  |  |  | 0.00% |  |  |  | 0.00% |  |  |  |  |  |  |
Nonrecurring [Member] | Measurement input, gross margin growth rate [Member] | Customer lists/relationships [Member] | Small business distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  |  |  |  |  | 1.00% |  |  |  | 1.00% |  |  |  |  |  |  |
Nonrecurring [Member] | Measurement input, discount rate [Member] | Customer lists/relationships [Member] | Small business distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  |  |  |  |  | 11.00% |  |  |  | 11.00% |  |  |  |  |  |  |
Significant unobservable inputs (Level 3) [Member] | Assets held for sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  | $ 11,210 |  |  |  | $ 11,210 |  |  |  |  |  |  |
Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member] | Customer lists/relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member] | Customer lists/relationships [Member] | Small business distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  | $ 4,479 |  |  |  | $ 4,479 |  |  |  |  |  |  |
Reporting units for which qualitative analysis completed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_units |  |  |  |  |  | 2 |  | 4 |  |  |  |  |  |  |  |  |
Reporting units for which qualitative analysis completed [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,000
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Reporting units for which qualitative analysis completed [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,405,000
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 314.00%
Payments reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 490,000 |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189.00% |  |
Checks reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 954,000 |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180.00% |  |
Reporting units for which quantitative analysis completed [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | reporting_units |  | 2 |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |
Reporting units for which quantitative analysis completed [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,000 |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121.00% |  |
Reporting units for which quantitative analysis completed [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 954,000 |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189.00% |  |
Cloud Data Analytics reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 63.00% |  |  |
Promotional Solutions reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  | 67,132 |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,000 |  |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 132.00% |  |  |
Goodwill |  | $ 59,009 |  |  |  |  | 59,009 |  |  |  |  |  |  |  |  |  |
Direct-to-Consumer reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of reporting unit's net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |
Excess of fair value over carrying value of reporting unit, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% |  |
Cloud Solution Web Hosting reporting unit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  | 4,317 |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | [1] |  |  |  |  |  | 17,678 |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  | $ 2,172 |  |  |  |  | 2,172 |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Customer lists/relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 8,397 |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Internal-use software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 6,932 |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Other intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | $ 2,349 |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Measurement input, revenue growth rate [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  | (31.00%) |  |  |  |  | (31.00%) |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Measurement input, gross margin growth rate [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  | (5.20%) |  |  |  |  | (5.20%) |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Nonrecurring [Member] | Measurement input, discount rate [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles fair value inputs |  | 9.00% |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Cloud Solution Web Hosting reporting unit [Member] | Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  | $ 2,172 |  |  |  |  | $ 2,172 |  |  |  |  |  |  |  |  |  |
Financial Servcices Data-Driven Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  | $ 145,584 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,804 |
Small Business Services Web Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  | 242,267 |  |  |  |  |  |  |  |  |
Small Business Services Web Services [Member] | Nonrecurring [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | [2] |  |  |  |  |  |  | 31,316 |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,379 |
Small Business Services Web Services [Member] | Nonrecurring [Member] | Trade names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  | 14,441 |  |  |  |  |  |  |  |  |
Small Business Services Web Services [Member] | Nonrecurring [Member] | Customer lists/relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  | 11,655 |  |  |  |  |  |  |  |  |
Small Business Services Web Services [Member] | Nonrecurring [Member] | Technology-based intangibles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  | $ 5,220 |  |  |  |  |  |  |  |  |
Small Business Services Web Services [Member] | Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member] | Intangible assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of asset impairment analyses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value as of measurement date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,379 |
[1] | The impairment charge consisted of $8,397 related to customer lists, $6,932 related to internal-use software and $2,349 related to other intangible assets.
[2] | The impairment charge consisted of $14,441 related to trade names, $11,655 related to customer lists and $5,220 related to technology-based intangible assets.

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