Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows provided by operating activities:
Net income	$ 59,564	$ 58,078
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	3,369	3,190
Depreciation and amortization	5,537	5,724
Amortization of intangible assets	2,105	2,105
Deferred income taxes	1,816	1,480
Other, including fixed asset impairments	410	719
Changes in assets and liabilities:
Accounts receivable from university partners	(25,158)	(31,943)
Other assets	(4,625)	(5,312)
Right-of-use assets and lease liabilities	419	179
Accounts payable	1,953	5,427
Accrued liabilities	(6,294)	2,377
Income taxes receivable/payable	14,225	16,074
Deferred revenue	9,678	12,162
Net cash provided by operating activities	62,999	70,260
Cash flows used in investing activities:
Capital expenditures	(8,587)	(6,784)
Additions of amortizable content	(244)	(95)
Purchases of investments	(52,556)	(62,834)
Proceeds from sale or maturity of investments	24,253
Net cash used in investing activities	(37,134)	(69,713)
Cash flows used in financing activities:
Repurchase of common shares and shares withheld in lieu of income taxes	(41,234)	(399,555)
Net cash used in financing activities	(41,234)	(399,555)
Net decrease in cash and cash equivalents and restricted cash	(15,369)	(399,008)
Cash and cash equivalents and restricted cash, beginning of period	120,409	600,941
Cash and cash equivalents and restricted cash, end of period	105,040	201,933
Supplemental disclosure of cash flow information
Cash paid for interest	19
Cash paid for income taxes	230	306
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment included in accounts payable	973	1,442
ROU Asset and Liability recognition		$ 1,980
Excise tax on treasury stock repurchases	$ 187