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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 311,732 $ 155,933
Marketable securities, current 37,121  
Tuition receivable, net 55,694 23,122
Other current assets 15,814 11,293
Total current assets 420,361 190,348
Property and equipment, net 122,677 73,763
Marketable securities, non-current 37,678  
Deferred income tax assets   24,452
Intangible assets, net 328,344 7,260
Goodwill 732,540 20,744
Other assets 19,429 4,711
Total assets 1,661,029 321,278
Current liabilities:    
Accounts payable and accrued expenses 85,979 46,177
Income taxes payable 419 1,038
Contract liabilities 38,733 21,851
Total current liabilities 125,131 69,066
Deferred income tax liabilities 59,358  
Other long-term liabilities 51,316 43,015
Total liabilities 235,805 112,081
Commitments and contingencies
Stockholders' equity:    
Common stock, par value $0.01; 32,000,000 shares authorized; 11,167,425 and 21,743,498 shares issued and outstanding at December 31, 2017 and 2018, respectively 217 112
Additional paid-in capital 1,306,653 47,079
Accumulated other comprehensive income 32  
Retained earnings 118,322 162,006
Total stockholders' equity 1,425,224 209,197
Total liabilities and stockholders' equity $ 1,661,029 $ 321,278