ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts Payable and Accrued Liabilities [Abstract]
Funds held for customers	$ 775,852	$ 645,863
Trade accounts payable	262,014	128,721
Contract liabilities	227,783	217,938
Payment network fees	187,665	166,880
Compensation and benefits	184,580	194,090
Operating lease liabilities	103,554	103,706
Third-party commissions	88,109	74,391
Audit and legal	82,108	44,146
Miscellaneous taxes and withholdings	68,323	68,048
Interest	64,591	62,865
Income taxes payable	51,818	13,517
Unclaimed property	34,744	32,497
Interest rate swap liabilities	28,777	1,330
Third-party processing fees	27,345	24,619
Current portion of accrued buyout liability	22,204	16,180
Settlement of common share repurchases	0	20,000
Other	332,789	246,593
Accounts payable and accrued liabilities	2,542,256	2,061,384
Noncurrent accrued buyout liability	$ 44,600	$ 30,700

Accrued Buyout Liability, Current

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Accrued Buyout Liability, Noncurrent

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Accrued Fees and Assessment Expenses, Current

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Accrued Third Party Processing, Current

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Contract with Customer, Liability, Current, Customer Deposits

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Share Repurchase Accrual, Current

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Unclaimed Property Liability, Current

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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