Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows provided by operating activities:
Net income	$ 184,675	$ 260,344	$ 257,196
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	12,642	11,526	10,663
Reversal of credit loss reserve		(5,000)
Depreciation and amortization	22,758	21,994	21,233
Amortization of intangible assets	8,419	8,419	8,419
Deferred income taxes	401	5,674	3,136
Other, including fixed asset impairments	853	677	571
Changes in assets and liabilities:
Accounts receivable and interest receivable from university partners	(7,350)	(2,863)	(13,250)
Other assets	(2,604)	(256)	(621)
Right-of-use assets and lease liabilities	1,193	545	2,151
Accounts payable	(3,894)	7,392	1,012
Accrued liabilities	(1,023)	4,148	18,612
Income taxes receivable/payable	4,759	509	(279)
Deferred revenue	(10)	10	(20)
Net cash provided by operating activities	220,819	313,119	308,823
Cash flows (used in) provided by investing activities:
Capital expenditures	(35,232)	(28,875)	(29,418)
Additions of amortizable content	(397)	(515)	(524)
Funding to GCU		(190,000)	(75,000)
Repayment by GCU		1,159,912	75,000
Purchases of investments	(171,549)	(56,335)
Proceeds from sale or maturity of investments	110,039	66,792	10,591
Net cash (used in) provided by investing activities	(97,139)	950,979	(19,351)
Cash flows used in financing activities:
Principal payments on notes payable		(107,774)	(33,144)
Repurchase of common shares and shares withheld in lieu of income taxes	(604,212)	(803,832)	(134,014)
Net proceeds from exercise of stock options		2,680	883
Net cash used in financing activities	(604,212)	(908,926)	(166,275)
Net (decrease) increase in cash and cash equivalents and restricted cash	(480,532)	355,172	123,197
Cash and cash equivalents and restricted cash, beginning of period	600,941	245,769	122,572
Cash and cash equivalents and restricted cash, end of period	120,409	600,941	245,769
Supplemental disclosure of cash flow information
Cash paid for interest	2	3,697	4,306
Cash paid for income taxes	48,573	61,900	68,381
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment included in accounts payable	1,131	1,536	1,206
Allowance for credit losses of $5,000, net of taxes of $1,168 from adoption of ASU 2016-13			3,832
ROU Asset and Liability recognition	$ 15,067	$ 3,368	$ 33,250