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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 60,616 | $ 100,738
Accumulated Amortization | 30,465 | 65,446
Net Carrying Value | 30,151 | 35,292
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 0 | 16,200
Accumulated Amortization | 0 | 16,200
Net Carrying Value | 0 | 0
Merchant relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 20,208 | 22,193
Accumulated Amortization | 9,236 | 8,268
Net Carrying Value | 10,972 | 13,925
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 9,651 | 9,558
Accumulated Amortization | 7,921 | 7,369
Net Carrying Value | 1,730 | 2,189
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2,121 | 3,651
Accumulated Amortization | 1,863 | 2,685
Net Carrying Value | 258 | 966
Patents |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 10,813 | 23,021
Accumulated Amortization | 4,697 | 18,167
Net Carrying Value | 6,116 | 4,854
Other intangible assets |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 17,823 | 26,115
Accumulated Amortization | 6,748 | 12,757
Net Carrying Value | $ 11,075 | $ 13,358

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