ACQUISITIONS - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Feb. 08, 2022	Dec. 31, 2021	Apr. 21, 2021	Dec. 31, 2020
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Goodwill	$ 2,489,308		$ 2,359,674		$ 838,428
US eDirect Inc
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Cash		$ 6,361
Accounts receivable		1,730
Other current assets		594
Other noncurrent assets		698
Goodwill and identifiable intangible assets		125,541
Identifiable intangible assets		34,100
Goodwill		91,400
Accounts payable		(1,881)
Accrued expenses		(357)
Other noncurrent liabilities		(742)
Deferred revenue		(688)
Deferred tax liabilities, net		(8,326)
Total consideration		$ 122,930
Corporate
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Cash				$ 331,783
Accounts receivable				149,515
Other current assets				12,988
Other noncurrent assets				20,974
Identifiable intangible assets				777,000
Goodwill				1,446,868
Accounts payable				(150,099)
Accrued expenses				(63,154)
Other noncurrent liabilities				(11,493)
Deferred revenue				(3,294)
Deferred tax liabilities, net				(190,596)
Total consideration				$ 2,320,492