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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 18, 2019 USD ($) | Dec. 31, 2021 USD ($) segment shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Product Information [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  | 3 |  |  |  |
Stockholders' equity |  | $ 25,869,417 | $ 27,487,044 | $ 28,054,989 |  | $ 4,186,343
Operating lease liabilities |  | 654,280 |  |  |  |
Operating lease right-of-use-assets |  | 494,082 | 481,197 |  |  |
Cash available for general purposes |  | 894,600 | 1,100,900 |  |  |
Allowance for credit loss related to accounts receivable |  | 17,400 | 20,600 |  |  |
Credit loss expense related to accounts receivable |  | 12,800 | 23,000 |  |  |
Allowance for credit losses related to settlement processing assets |  | 3,000 | 6,200 |  |  |
Credit loss expense related to settlement processing assets |  | 3,600 | 16,800 |  |  |
Allowance for credit losses related to check guarantee claims receivable |  | 2,500 | 2,100 |  |  |
Credit loss provisions related to check guarantee claims receivable |  | $ 10,200 | $ 10,100 |  |  |
Buyout of relationship managers and sales managers commissions, fixed multiple period |  | 12 months |  |  |  |
Antidilutive securities excluded from computation of earnings per share (shares) | shares |  | 234,813 | 124,888 | 0 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Operating lease liabilities |  |  |  |  | $ 274,000 |
Operating lease right-of-use-assets |  |  |  |  | $ 236,000 |
CUP Data |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Ownership interest in equity method investment (as a percent) |  | 45.00% |  |  |  |
Minimum |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Amortization period of capitalized contract costs |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Amortization period of capitalized contract costs |  | 7 years |  |  |  |
Retained Earnings |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Stockholders' equity |  | $ 2,982,122 | $ 2,570,874 | $ 2,333,011 |  | $ 2,066,415
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  | (5,379) |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  | $ (5,379) |  |
Internal-Use Software |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Capitalized implementation costs, net of accumulated amortization |  | 72,400 | 16,200 |  |  |
Amortization expense of capitalized implementation costs |  | $ 3,000 | $ 3,100 |  |  |
Internal-Use Software | Minimum |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Estimated useful life |  | 5 years |  |  |  |
Internal-Use Software | Maximum |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Estimated useful life |  | 10 years |  |  |  |
Total System Services, Inc. |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Total purchase consideration | $ 24,474,953 |  |  |  |  |

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