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Acquisition (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 22, 2019	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquisition
Goodwill			$ 160,766	$ 160,766
Pro forma information
Service revenue		$ 213,247	896,564	844,096	$ 778,643
Pro forma, net revenue		213,247			781,893
Net income		76,669	260,344	257,196	259,175
Pro forma, net income		76,669			247,930
Amortization of intangible assets			$ 8,419	$ 8,419	8,223
Orbis Education
Acquisition
Purchase price	$ 361,184
Operating cash on hand used for acquisition	171,034
Goodwill	157,825
Transaction costs					3,966
Assets acquired
Cash	4,793
Cash, pledged collateral	300
Accounts receivable, net of allowance of $0	3,236
Accounts receivable, allowance	0
Property and equipment	5,392
Right-of-use assets	13,069
Intangible assets	210,280
Other assets	2,793
Liabilities assumed
Accounts payable	4,308
Accrued and other liabilities	4,451
Lease liability	13,069
Deferred tax liability	9,538	$ 9,538			9,538
Deferred revenue	45
Total net asset or liability purchased and assumed	208,152
Purchase price	365,977
Orbis Education | University partner relationships
Assets acquired
Intangible assets	210,000
Orbis Education | Credit facility
Acquisition
Purchase price	$ 191,000
Orbis Education
Pro forma information
Service revenue					85,869
Net income					(2,588)
Amortization of intangible assets					$ 8,223

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