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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income $ 46,670 $ 55,087 $ 86,268
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on sale of marketable securities 0 781 0
Gain on sale of property and equipment (2,886) (2,656) 0
Amortization of deferred financing costs 552 552 466
Amortization of investment discount/premium 32 70 146
Depreciation and amortization 63,124 103,416 109,154
Deferred income taxes (8,667) (7,710) (13,431)
Stock-based compensation 21,792 18,149 14,610
Impairment of right-of-use lease assets 1,185 18,876 848
Changes in assets and liabilities:      
Tuition receivable, net (12,558) (196) 19,659
Other assets 3,584 (6,964) (32,326)
Accounts payable and accrued expenses (4,339) (6,700) (22,685)
Income taxes payable and income taxes receivable 7,580 1,196 (4,020)
Contract liabilities 18,960 13,995 (10,095)
Other liabilities (8,977) (7,369) (5,689)
Net cash provided by operating activities 126,052 180,527 142,905
Cash flows from investing activities:      
Cash paid for acquisition, net of cash acquired (800) 0 (628,759)
Purchases of property and equipment (43,170) (49,433) (46,812)
Purchases of marketable securities 0 0 (1,863)
Proceeds from marketable securities 6,420 9,300 36,192
Proceeds from sale of property and equipment 6,525 8,331 0
Other investments (335) (1,292) (950)
Net cash used in investing activities (31,360) (33,094) (642,192)
Cash flows from financing activities:      
Net proceeds from issuance of common stock 0 0 220,248
Proceeds from long-term debt 0 0 145,630
Common dividends paid (59,240) (59,045) (55,956)
Net payments for stock awards (3,004) (2,938) (24,741)
Payments on long-term debt (40,000) 0 (3,807)
Payment of deferred financing costs 0 0 (1,940)
Repurchase of common stock (40,116) (5,905) (247)
Net cash provided by (used in) financing activities (142,360) (67,888) 279,187
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (4,090) (2,353) 1,623
Net increase (decrease) in cash, cash equivalents, and restricted cash (51,758) 77,192 (218,477)
Cash, cash equivalents, and restricted cash - beginning of period 279,212 202,020 420,497
Cash, cash equivalents, and restricted cash - end of period 227,454 279,212 202,020
Noncash transactions:      
Non-cash additions to property and equipment $ 1,718 $ 9,308 $ 4,079