Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents (Note 2)	$ 179,205	$ 146,351
Accounts receivable, net of allowance of $8,077 in 2016 and $6,276 in 2017.	7,136	6,949
Prepaid expenses	4,792	5,327
Total current assets	191,133	158,627
Property and equipment, net	92,374	97,687
Assets held for sale	0	2,100
Investments	12,481	14,611
Goodwill	33,899	33,899
Other assets, net	9,151	8,696
Total assets	339,038	315,620
Current liabilities:
Accounts payable	8,844	6,853
Accrued liabilities	13,423	14,124
Deferred revenue	19,374	20,639
Income tax payable	1,710	559
Total current liabilities	43,351	42,175
Deferred income taxes	6,281	8,775
Total liabilities	49,632	50,950
Commitments and contingencies (Notes 8 and 12)
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; 16,109 issued and outstanding in 2016; 16,268 issued and outstanding in 2017	163	161
Additional paid-in capital	180,674	177,061
Retained earnings	108,569	87,448
Total stockholders’ equity	289,406	264,670
Total liabilities and stockholders’ equity	$ 339,038	$ 315,620