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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 18, 2019 USD ($) | Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Product Information [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  | 3 |  |  |  |  |
Stockholders' equity |  | $ 27,487,044 | $ 28,054,989 | $ 4,186,343 |  |  | $ 3,965,231
Total operating lease right-of-use-assets |  | 481,197 | 436,800 |  |  |  |
Operating lease liabilities |  | 551,722 |  |  |  |  |
Other noncurrent assets |  | 2,135,692 | 1,810,225 |  |  |  |
Deferred income taxes |  | 2,948,390 | $ 3,145,641 |  |  |  |
Allowance for credit loss related to accounts receivable |  | 20,600 |  |  |  |  |
Credit loss expense related to accounts receivable |  | 23,000 |  |  |  |  |
Allowance for credit losses related to settlement processing assets |  | 6,200 |  |  |  |  |
Credit loss expense related to settlement processing assets |  | 16,800 |  |  |  |  |
Allowance for credit losses related to check guarantee claims receivable |  | 2,100 |  |  |  |  |
Credit loss provisions related to check guarantee claims receivable |  | $ 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 |  | 124,888 | 0 | 0 |  |  |
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 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Total operating lease right-of-use-assets |  |  |  |  | $ 274,000 |  |
Operating lease liabilities |  |  |  |  | $ 236,000 |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Other noncurrent assets |  |  |  |  |  | $ 64,600 |
Deferred income taxes |  |  |  |  |  | $ 15,600 |
Retained Earnings |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  | $ 2,570,874 | $ 2,333,011 | $ 2,066,415 |  |  | 1,597,897
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  |  | (5,379) |  |  |  | 49,126
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  | (5,400) | $ (5,379) |  |  |  | $ 50,969
Internal-Use Software |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Capitalized implementation costs, net of accumulated amortization |  | 16,200 |  |  |  |  |
Amortization expense of capitalized implementation costs |  | $ 3,100 |  |  |  |  |
Internal-Use Software | Minimum |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Estimated useful life |  | 2 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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