CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 35,341	$ 33,087
Accounts receivable (less allowance for losses of $1,571 in 2016 and $1,640 in 2015)	137,332	176,360
Short-term investments	18,332	13,423
Prepaid expenses	20,984	22,334
Income tax receivable	11,798	21,080
Other current assets	1,749	1,931
Total current assets	225,536	268,215
Accounts receivable, long-term	3,098	2,777
Property and equipment, net	114,291	101,112
Other assets:
Goodwill	655,167	653,666
Other intangibles, net	286,475	295,378
Non-current investments and other assets	33,442	35,422
Total assets	1,318,009	1,356,570
Current liabilities:
Accounts payable	6,316	6,789
Accrued liabilities	33,260	49,156
Deferred revenue	250,108	281,627
Total current liabilities	289,684	337,572
Revolving line of credit	140,000	66,000
Deferred revenue, long-term	4,561	3,115
Deferred income taxes	$ 91,775	$ 91,026
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 2016 and 2015	$ 481	$ 481
Additional paid-in capital	608,496	607,755
Accumulated other comprehensive loss, net of tax	(46)	(46)
Retained earnings	343,098	326,019
Treasury stock, at cost; 12,043,727 and 11,373,666 shares in 2016 and 2015, respectively	(160,040)	(75,352)
Total shareholders' equity	791,989	858,857
Liabilities and Shareholders' equity, Total	$ 1,318,009	$ 1,356,570