Acquisition Activity - Narrative (Details) - USD ($)		3 Months Ended			9 Months Ended
	Jan. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Aug. 10, 2021
Purchase Price Allocation
Goodwill		$ 59,593,000			$ 59,593,000		$ 112,593,000	$ 243,486,000
Gain on the acquisition		$ 0	$ 0		$ 0	$ 3,828,000
Business Combination Bargain Purchase Gain Recognized Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Consolidated Statements of Income
Graduate School USA
Purchase Price Allocation
Aggregate purchase price	$ 1,000,000
Net working capital	1,900,000
Initial cash payment	500,000
Consideration retained by acquirer	500,000
Purchase price consideration, liability	500,000
Goodwill	0								$ 0
Gain on the acquisition	$ 4,500,000			$ 3,800,000
Reduction of gain on acquisition				$ 700,000