Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,633,251	$ 2,552,369	$ 2,554,987
Radixx Solutions International, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents	$ 3,348
Accounts receivable	2,587
Other current assets	244
Goodwill	82,402
Property and equipment, net	2,142
Deferred tax assets	2,968
Other long term assets, net	2,641
Current liabilities	(7,071)
Deferred tax liabilities	(1,583)
Other noncurrent liabilities	(2,668)
Total acquisition price	110,810
Radixx Solutions International, Inc. | Acquired customer relationships, net
Business Acquisition [Line Items]
Intangible assets	$ 13,600
Weighted-average useful life of intangible assets acquired	10 years
Radixx Solutions International, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 10,800
Weighted-average useful life of intangible assets acquired	5 years
Radixx Solutions International, Inc. | Trade name
Business Acquisition [Line Items]
Intangible assets	$ 1,400
Weighted-average useful life of intangible assets acquired	18 years