Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents (Note 2)	$ 197,596	$ 179,205
Accounts receivable, net of allowance of $6,415 in 2018 and $6,276 in 2017	13,274	7,136
Prepaid expenses	5,664	4,792
Income tax receivable	3,197	0
Total current assets	219,731	191,133
Property and equipment, net	84,849	92,374
Investments	11,998	12,481
Goodwill	33,899	33,899
Other assets, net	7,548	9,151
Total assets	358,025	339,038
Current liabilities:
Accounts payable	4,303	8,844
Accrued liabilities	14,467	13,423
Deferred revenue	22,191	19,374
Income tax payable	0	1,710
Total current liabilities	40,961	43,351
Deferred income taxes	7,013	6,281
Total liabilities	47,974	49,632
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $.01 par value; Authorized shares - 10,000; no shares issued or outstanding	0	0
Common stock, $.01 par value; Authorized shares - 100,000; 16,424 issued and outstanding in 2018; 16,268 issued and outstanding in 2017	164	163
Additional paid-in capital	185,050	180,674
Retained earnings	124,837	108,569
Total stockholders’ equity	310,051	289,406
Total liabilities and stockholders’ equity	$ 358,025	$ 339,038