CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 351,781	$ 527,012
Accounts receivable, net of allowance for doubtful accounts of approximately $7,160 and $4,815 as of June 30, 2015 and December 31, 2014, respectively	54,382	38,694
Deferred and other income taxes, net	28,509	20,007
Income tax receivable	1,027	1,027
Prepaid expenses and other current assets	11,351	9,736
Debt issuance costs, net	3,298	3,335
Total current assets	450,348	599,811
Long-term investments	16,049	17,151
Property and equipment, net	85,442	73,753
Goodwill	1,246,789	1,138,805
Intangible assets, net	263,831	241,622
Deposits and other assets	3,243	2,676
Debt issuance costs, net	8,245	9,864
Total assets	2,073,947	2,083,682
Current liabilities:
Current portion of long-term debt	20,000	20,000
Accounts payable	6,778	8,608
Accrued wages and commissions	24,666	23,155
Accrued expenses	48,166	27,001
Deferred gain on the sale of building	2,523	2,523
Deferred revenue	39,185	38,003
Total current liabilities	141,318	119,290
Long-term debt, less current portion	355,000	365,000
Deferred gain on the sale of building	22,501	23,762
Deferred rent	30,131	27,032
Deferred income taxes, net	14,069	30,349
Income taxes payable	4,775	4,703
Total liabilities	567,794	570,136
Stockholders' equity:
Total stockholders’ equity	1,506,153	1,513,546
Total liabilities and stockholders’ equity	$ 2,073,947	$ 2,083,682