Acquisitions - Schedule of Final Allocation of Purchase Price (Details) - USD ($) $ in Thousands	Jan. 02, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair value of assets acquired and liabilities assumed:
Goodwill		$ 425,677	$ 425,677	$ 405,053
Payment Service Network, Inc.
Fair value of consideration transferred:
Cash paid, net of cash acquired	$ 20,213
Fair value of contingent consideration at acquisition	4,434
Working capital adjustment	(52)
Total purchase price consideration	24,595
Fair value of assets acquired and liabilities assumed:
Unbilled receivables	1,040
Prepaid expenses and other current assets	183
Property and equipment	127
Goodwill	17,447
Total assets acquired	28,448
Accounts payable	(27)
Accrued expenses and other current liabilities	(1,303)
Deferred revenue	(104)
Deferred income taxes	(2,419)
Net assets acquired	24,595
Customer Relationships | Payment Service Network, Inc.
Fair value of assets acquired and liabilities assumed:
Acquired intangible assets	6,563
Trade Names | Payment Service Network, Inc.
Fair value of assets acquired and liabilities assumed:
Acquired intangible assets	356
Developed Technology | Payment Service Network, Inc.
Fair value of assets acquired and liabilities assumed:
Acquired intangible assets	$ 2,732