Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 52,601	$ (38,126)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of deferred financing costs	250	209
Amortization of investment discount/premium	286	132
Depreciation and amortization	78,862	29,107
Deferred income taxes	971	(4,443)
Stock-based compensation	9,075	11,781
Impairment of intangible assets	0	19,304
Changes in assets and liabilities:
Tuition receivable, net	2,258	8,227
Other current assets	(921)	2,223
Other assets	(727)	(581)
Accounts payable and accrued expenses	(2,022)	(8,949)
Income taxes payable and income taxes receivable	(7,125)	(7,868)
Contract liabilities	10,311	(21,946)
Other long-term liabilities	(2,412)	(3,717)
Net cash provided by (used in) operating activities	141,407	(14,647)
Cash flows from investing activities:
Net cash acquired in acquisition	0	168,387
Purchases of property and equipment	(27,769)	(16,028)
Purchases of marketable securities	(17,769)	(11,346)
Maturities of marketable securities	32,860	5,842
Other investments	(878)	(167)
Net cash provided by (used in) investing activities	(13,556)	146,688
Cash flows from financing activities:
Common dividends paid	(33,297)	(16,802)
Net payments for stock awards	(9,195)	6,372
Payment of deferred financing costs	0	(1,162)
Net cash used in financing activities	(42,492)	(11,592)
Net increase in cash, cash equivalents, and restricted cash	85,359	120,449
Cash, cash equivalents, and restricted cash — beginning of period	312,237	156,448
Cash, cash equivalents, and restricted cash — end of period	397,596	276,897
Noncash transactions:
Purchases of property and equipment included in accounts payable	$ 1,821	$ 2,975