Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows provided by operating activities:
Net income	$ 204,985	$ 184,675	$ 260,344
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	13,204	12,642	11,526
Reversal of credit loss reserve			(5,000)
Depreciation and amortization	23,554	22,758	21,994
Amortization of intangible assets	8,419	8,419	8,419
Deferred income taxes	402	401	5,674
Other, including fixed asset disposals	(442)	853	677
Changes in assets and liabilities:
Accounts receivable from university partners	(1,398)	(7,350)	(2,863)
Other assets	(1,639)	(2,604)	(256)
Right-of-use assets and lease liabilities	2,105	1,193	545
Accounts payable	(3,109)	(3,894)	7,392
Accrued liabilities	(1,974)	(1,023)	4,148
Income taxes receivable/payable	(445)	4,759	509
Deferred revenue		(10)	10
Net cash provided by operating activities	243,662	220,819	313,119
Cash flows used in investing activities:
Capital expenditures	(44,537)	(35,232)	(28,875)
Additions of amortizable content	(897)	(397)	(515)
Funding to GCU			(190,000)
Repayment by GCU			1,159,912
Purchases of investments	(98,853)	(171,549)	(56,335)
Proceeds from sale or maturity of investments	63,815	110,039	66,792
Net cash used in investing activities	(80,472)	(97,139)	950,979
Cash flows used in financing activities:
Principal payments on notes payable			(107,774)
Repurchase of common shares and shares withheld in lieu of income taxes	(137,124)	(604,212)	(803,832)
Net proceeds from exercise of stock options			2,680
Net cash used in financing activities	(137,124)	(604,212)	(908,926)
Net increase (decrease) in cash and cash equivalents and restricted cash	26,066	(480,532)	355,172
Cash and cash equivalents and restricted cash, beginning of period	120,409	600,941	245,769
Cash and cash equivalents and restricted cash, end of period	146,475	120,409	600,941
Supplemental disclosure of cash flow information
Cash paid for interest	33	2	3,697
Cash paid for income taxes	59,026	48,573	61,900
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment included in accounts payable	1,909	1,131	1,536
ROU Asset and Liability recognition	19,735	$ 15,067	$ 3,368
Excise tax on treasury stock repurchases	$ 1,146