CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 204,103	$ 206,167
Accounts receivable (less allowance for losses of $1,361 in 2015 and $1,725 in 2014)	152,178	112,660
Prepaid expenses	18,979	17,851
Other current assets	10,590	358
Deferred income taxes	9,674	9,674
Total current assets	395,524	346,710
Accounts receivable, long-term portion	391	1,761
Property and equipment, net	67,908	65,910
Other assets:
Goodwill	131,960	124,142
Other intangibles, net	31,507	34,722
Cost method investment	15,000
Other non-current assets	3,744	737
Total assets	646,034	573,982
Current liabilities:
Accounts payable	4,385	4,119
Accrued liabilities	34,810	39,508
Deferred revenue	201,549	189,212
Total current liabilities	240,744	232,839
Deferred income taxes	$ 4,673	$ 4,170
Commitments and contingencies
Shareholders' equity:
Preferred stock, $10.00 par value; 1,000,000 shares authorized; none issued
Common stock, $0.01 par value; 100,000,000 shares authorized; 48,147,969 shares issued in 2015 and 2014	$ 481	$ 481
Additional paid-in capital	221,838	201,389
Accumulated other comprehensive loss, net of tax	(46)	(46)
Retained earnings	297,259	261,150
Treasury stock, at cost; 14,4294,303 and 14,678,782 shares in 2015 and 2014, respectively	(118,915)	(126,001)
Total shareholders' equity	400,617	336,973
Liabilities and Shareholders' equity, Total	$ 646,034	$ 573,982