Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 36,151	$ 33,087
Accounts receivable (less allowance for losses of $3,396 in 2016 and $1,640 in 2015)	200,334	176,360
Short-term investments	20,273	13,423
Prepaid expenses	21,039	22,334
Income tax receivable	2,895	21,080
Other current assets	2,268	1,931
Total current assets	282,960	268,215
Accounts receivable, long-term	2,480	2,777
Property and equipment, net	124,268	101,112
Other assets:
Goodwill	650,237	653,666
Other intangibles, net	267,259	295,378
Cost method investment	15,000	15,000
Non-current investments and other assets	15,741	20,422
Total assets	1,357,945	1,356,570
Current liabilities:
Accounts payable	7,295	6,789
Accrued liabilities	55,989	49,156
Deferred revenue	298,217	281,627
Total current liabilities	361,501	337,572
Revolving line of credit	10,000	66,000
Deferred revenue, long-term	2,140	3,115
Deferred income taxes	68,779	91,026
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 in 2016 and 2015	481	481
Additional paid-in capital	556,663	607,755
Accumulated other comprehensive loss, net of tax	(46)	(46)
Retained earnings	435,876	326,019
Treasury stock, at cost; 11,381,733 and 11,373,666 shares in 2016 and 2015, respectively	(77,449)	(75,352)
Total shareholders' equity	915,525	858,857
Liabilities and Shareholders' equity, Total	$ 1,357,945	$ 1,356,570