Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 155,933	$ 129,245
Tuition receivable, net	23,122	20,532
Other current assets	11,293	10,766
Total current assets	190,348	160,543
Property and equipment, net	73,763	73,124
Deferred income taxes	24,452	31,096
Goodwill	20,744	20,744
Other assets	11,971	13,189
Total assets	321,278	298,696
Current liabilities:
Accounts payable and accrued expenses	46,177	41,132
Income taxes payable	1,038	1,883
Deferred revenue	21,851	16,691
Other current liabilities		133
Total current liabilities	69,066	59,839
Other long-term liabilities	43,015	50,483
Total liabilities	112,081	110,322
Commitments and contingencies
Stockholders' equity:
Common stock, par value $0.01; 20,000,000 shares authorized; 11,093,489 and 11,167,425 shares issued and outstanding at December 31, 2016 and 2017, respectively	112	111
Additional paid-in capital	47,079	35,453
Retained earnings	162,006	152,810
Total stockholders' equity	209,197	188,374
Total liabilities and stockholders' equity	$ 321,278	$ 298,696