CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 114,034	$ 162,567
Short-term investments	614,130
Accounts receivable (net of allowances of $1,022 and $1,827 at December 31, 2015 and December 31, 2014, respectively)	81,305	43,938
Prepaid expenses and other current assets	16,162	6,015
Income tax receivable	18,377	6,797
Deferred income taxes		491
Total current assets	844,008	219,808
Noncurrent assets:
Property, equipment and capitalized software, net	65,031	50,962
Goodwill	137,733	62,269
Intangible assets, net	61,855	7,447
Other assets	4,250	2,083
Total assets	1,112,877	342,569
Current liabilities:
Accounts payable	21,136	10,974
Accrued compensation	13,538	15,305
Other current liabilities	11,444	1,992
Deferred rent	797	567
Deferred revenue	5,507	3,904
Credit facilities	15,000	18,750
Capital lease obligation	109	99
Total current liabilities	67,531	51,591
Noncurrent liabilities:
Credit facilities, less current portion	266,250	281,250
Capital lease obligation, less current portion	296	168
Deferred rent	2,446	2,619
Deferred income taxes	37,198	15,163
Total liabilities	$ 373,721	$ 350,791
Stockholders' equity (deficit):
Common stock
Preferred stock, $0.0001 par value, 100,000,000 shares authorized, zero shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively
Additional paid-in-capital	$ 493,197	$ 110,317
Retained earnings	247,540	181,477
Treasury stock, at cost, zero and 11,109,285 shares at December 31, 2015 and 2014, respectively		(300,017)
Other comprehensive income (loss)	(1,582)
Total stockholders' equity (deficit)	739,156	(8,222)
Total liabilities and stockholders' equity (deficit)	$ 1,112,877	$ 342,569
Class A Common
Stockholders' equity (deficit):
Common stock
Class B Common
Stockholders' equity (deficit):
Common stock	$ 1	$ 1