CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 232,555	$ 127,683
Short-term investments	293,101	445,315
Accounts receivable (net of allowances of $2,669 and $5,865 at September 30, 2017 and December 31, 2016, respectively)	83,818	85,591
Prepaid expenses and other current assets	11,747	12,100
Income tax receivable	4,104	15,165
Total current assets	625,325	685,854
Non-current assets:
Property, equipment and capitalized software, net	101,419	76,420
Goodwill	184,932	184,557
Intangible assets, net	93,176	103,549
Other assets	5,706	2,964
Total assets	1,010,558	1,053,344
Current liabilities:
Accounts payable	30,509	16,474
Accrued compensation	21,297	15,211
Other current liabilities	7,708	9,468
Deferred revenue	8,807	11,850
Deferred rent	1,520	1,016
Credit facilities	41,250	30,000
Capital lease obligation	108	115
Total current liabilities	111,199	84,134
Non-current liabilities:
Credit facilities, less current portion	202,500	236,250
Capital lease obligation, less current portion	136	215
Deferred rent	261	1,457
Other liabilities	11,932	13,158
Deferred income taxes	32,440	34,553
Total liabilities	358,468	369,767
Commitments and contingencies (Note 5)
Stockholders' equity:
Common stock	0	0
Preferred stock, $0.0001 par value, 100,000,000 shares authorized, zero shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	0	0
Additional paid-in-capital	532,084	516,300
Retained earnings	291,456	274,087
Other comprehensive loss	(234)	(580)
Total stockholders' equity	652,090	683,577
Total liabilities and stockholders' equity	1,010,558	1,053,344
Class A Common
Stockholders' equity:
Common stock	0	0
Treasury stock, Class A common stock, at cost, 12,744,489 and 7,508,985 shares at September 30, 2017 and December 31, 2016, respectively	(171,217)	(106,231)
Class B Common
Stockholders' equity:
Common stock	$ 1	$ 1