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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 124,264 $ 69,982 $ 55,181
Adjustments to reconcile net income to net      
Asset impairment 612    
Depreciation and amortization expense 14,786 9,145 9,394
Bad debt expense 47,556 43,454 31,940
Compensation expense related to share-based awards 13,379 9,274 5,614
Loss on disposition of asset   14  
Deferred income taxes 20,353 21,556 17,863
Changes in operating assets and liabilities:      
Student receivables, gross 7,092 (33,697) (10,541)
Allowance for credit losses (39,546) (36,326) (29,646)
Other receivables, net (99) 1,189 (1,286)
Inventories, prepaid expenses, and other current assets 3,031 (1,180) 3,053
Deposits and other non-current assets 151 (489) 711
Accounts payable 374 2,320 698
Accrued expenses and deferred rent obligations (11,135) 5,066 (35,448)
Deferred tuition revenue 5,138 (7,704) 9,454
Right of use asset and lease liability (6,000) (9,519)  
Net cash provided by operating activities 179,956 73,085 56,987
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of available-for-sale investments (403,673) (449,367) (309,784)
Sales of available-for-sale investments 287,249 462,325 275,024
Purchases of property and equipment (9,768) (5,174) (6,732)
Business acquisition (39,819)    
Other 103 (85)  
Net cash (used in) provided by investing activities (165,908) 7,699 (41,492)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Purchase of treasury stock (17,862) (3,875)  
Issuance of common stock 5,723 1,774 1,682
Payments of employee tax associated with stock compensation (912) (2,740) (3,345)
Net cash used in financing activities (13,051) (4,841) (1,663)
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH:   13  
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 997 75,956 13,832
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the year 108,687 32,731 18,899
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the year 109,684 108,687 32,731
Supplemental Cash Flow Information:      
Income taxes paid 611 46 266
Supplemental Non-Cash Disclosures:      
Amount held in escrow to secure indemnification obligations from business acquisition 4,000    
Non-cash additions to property and equipment 52 $ 38 $ (161)
Right of use assets obtained in exchange for lease liabilities $ 552