Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows provided by operating activities:
Net income	$ 88,537	$ 83,640
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	6,622	6,361
Depreciation and amortization	10,939	11,352
Amortization of intangible assets	4,210	4,210
Deferred income taxes	1,160	732
Other, including fixed asset impairments	842	631
Changes in assets and liabilities:
Accounts receivable from university partners	52,731	44,336
Other assets	(1,332)	(3,171)
Right-of-use assets and lease liabilities	787	322
Accounts payable	2,323	(6,285)
Accrued liabilities	(460)	5,568
Income taxes receivable/payable	(18,341)	(13,555)
Deferred revenue	9,110	11,948
Net cash provided by operating activities	157,128	146,089
Cash flows used in investing activities:
Capital expenditures	(17,599)	(15,136)
Additions of amortizable content	(488)	(114)
Purchases of investments	(73,807)	(91,361)
Proceeds from sale or maturity of investments	43,837	26,994
Net cash used in investing activities	(48,057)	(79,617)
Cash flows used in financing activities:
Repurchase of common shares and shares withheld in lieu of income taxes	(86,555)	(528,012)
Net cash used in financing activities	(86,555)	(528,012)
Net increase (decrease) in cash and cash equivalents and restricted cash	22,516	(461,540)
Cash and cash equivalents and restricted cash, beginning of period	120,409	600,941
Cash and cash equivalents and restricted cash, end of period	142,925	139,401
Supplemental disclosure of cash flow information
Cash paid for interest	26	5
Cash paid for income taxes	42,460	38,841
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment included in accounts payable	1,644	1,654
ROU Asset and Liability recognition	3,727	$ 503
Excise tax on treasury stock repurchases	$ 641