CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 192,012	$ 127,683
Short-term investments	339,536	445,315
Accounts receivable (net of allowances of $5,817 and $5,865 at June 30, 2017 and December 31, 2016, respectively)	95,698	85,591
Prepaid expenses and other current assets	10,851	12,100
Income tax receivable	7,837	15,165
Total current assets	645,934	685,854
Non-current assets:
Property, equipment and capitalized software, net	86,898	76,420
Goodwill	185,559	184,557
Intangible assets, net	96,027	103,549
Other assets	5,277	2,964
Total assets	1,019,695	1,053,344
Current liabilities:
Accounts payable	26,134	16,474
Accrued compensation	14,052	15,211
Other current liabilities	8,973	9,468
Deferred revenue	11,860	11,850
Deferred rent	1,118	1,016
Credit facilities	37,500	30,000
Capital lease obligation	117	115
Total current liabilities	99,754	84,134
Non-current liabilities:
Credit facilities, less current portion	213,750	236,250
Capital lease obligation, less current portion	155	215
Deferred rent	911	1,457
Other liabilities	15,007	13,158
Deferred income taxes	32,312	34,553
Total liabilities	361,889	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 March 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in-capital	526,363	516,300
Retained earnings	283,215	274,087
Other comprehensive loss	(369)	(580)
Total stockholders' equity	657,806	683,577
Total liabilities and stockholders' equity	1,019,695	1,053,344
Class A Common
Stockholders' equity:
Common stock	0	0
Treasury stock, Class A common stock, at cost, 11,205,992 and 7,508,985 shares at June 30, 2017 and December 31, 2016, respectively	(151,404)	(106,231)
Class B Common
Stockholders' equity:
Common stock	$ 1	$ 1