CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 63,731	$ 36,151
Accounts receivable (less allowance for losses of $4,105 in 2017 and $3,396 in 2016)	163,723	200,334
Short-term investments	20,056	20,273
Prepaid expenses	21,445	21,039
Income tax receivable	0	2,895
Other current assets	2,620	2,268
Total current assets	271,575	282,960
Accounts receivable, long-term	2,577	2,480
Property and equipment, net	142,109	124,268
Other assets:
Goodwill	650,237	650,237
Other intangibles, net	258,280	267,259
Non-current investments and other assets	30,903	30,741
Total assets	1,355,681	1,357,945
Current liabilities:
Accounts payable	6,130	7,295
Accrued liabilities	41,226	55,989
Deferred revenue	270,208	298,217
Current income tax payable	4,681	0
Total current liabilities	322,245	361,501
Revolving line of credit	0	10,000
Deferred revenue, long-term	1,908	2,140
Deferred income taxes	64,691	68,779
Commitments and contingencies
Shareholders' equity:
Preferred stock, $10.00 par value; 1,000,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 100,000,000 shares authorized; 48,147,969 shares issued and outstanding as of March 31, 2017 and December 31, 2016	481	481
Additional paid-in capital	569,763	556,663
Accumulated other comprehensive loss, net of tax	(46)	(46)
Retained earnings	468,182	435,876
Treasury stock, at cost; 11,086,018 and 11,381,733 shares in 2017 and 2016, respectively	(71,543)	(77,449)
Total shareholders' equity	966,837	915,525
Liabilities and Shareholders' equity, Total	$ 1,355,681	$ 1,357,945