CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 410,000	$ 208,944
Short-term investments	40,275	267,288
Accounts receivable (net of allowances of $1,545 and $2,038 at March 31, 2018 and December 31, 2017, respectively)	78,401	90,054
Prepaid expenses and other current assets	14,200	10,441
Income tax receivable	11,810	11,987
Total current assets	554,686	588,714
Non-current assets:
Property, equipment and capitalized software, net	139,989	125,768
Goodwill	184,932	184,932
Intangible assets, net	85,475	89,326
Other assets	10,474	6,338
Total assets	975,556	995,078
Current liabilities:
Accounts payable	32,010	34,109
Accrued compensation	12,927	18,592
Other current liabilities	19,163	15,277
Deferred revenue	12,068	6,954
Deferred rent	805	1,818
Credit facilities	45,000	45,000
Capital lease obligation	1,815	336
Total current liabilities	123,788	122,086
Non-current liabilities:
Credit facilities, less current portion	180,000	191,250
Capital lease obligation, less current portion	15,134	12,109
Deferred rent	1,567	219
Other liabilities	2,111	0
Deferred income taxes	21,195	26,642
Total liabilities	343,795	352,306
Commitments and contingencies (Note 6)
Stockholders’ equity:
Common stock	0	0
Preferred stock, $0.0001 par value, 100,000,000 shares authorized, zero shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	0
Additional paid-in-capital	538,873	534,159
Retained earnings	292,801	308,905
Treasury stock, at cost, 14,620,175 shares at March 31, 2018 and December 31, 2017, respectively	(199,817)	(199,817)
Other comprehensive loss	(97)	(476)
Total stockholders’ equity	631,761	642,772
Total liabilities and stockholders’ equity	975,556	995,078
Class A Common
Stockholders’ equity:
Common stock	0	0
Class B Common
Stockholders’ equity:
Common stock	$ 1	$ 1