Acquisitions and Dispositions of Businesses (Assets and Liabilities of Businesses Classified as Held for Sale (Details 3) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 28,801
Restricted cash	6,041
Current Assets Held for Sale	49,140	$ 0
Noncurrent Assets Held for Sale	14,149	0
Current Liabilities Held for Sale	56,002	0
Noncurrent Liabilities Held for Sale	12,347	$ 0
Kaplan Languages Group (KLG) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Valuation allowance on assets held for sale	(16,600)
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Kaplan Languages Group (KLG) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	28,801
Restricted cash	6,041
Accounts receivable, net	7,779
Prepaid expenses	5,934
Other current assets	585
Current Assets Held for Sale	49,140
Property, plant and equipment, net	8,106
Lease right-of-use assets	19,772
Amortized intangible assets, net	458
Deferred charges and other assets	2,400
Valuation allowance on assets held for sale	(16,587)
Noncurrent Assets Held for Sale	14,149
Accounts payable and accrued liabilities	18,877
Deferred revenue	31,696
Income taxes payable	(35)
Current portion of lease liabilities	5,464
Current Liabilities Held for Sale	56,002
Other liabilities	1,768
Deferred income taxes	(3,545)
Lease liabilities	14,124
Noncurrent Liabilities Held for Sale	$ 12,347