CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 536,258	$ 368,531
Short-term investments	21,739	353,130
Accounts receivable, net of allowances of $3,447 and $3,465, respectively	188,509	235,705
Deferred tax assets	44,749	46,867
Prepaid expenses and other current assets	42,809	25,447
Total current assets	834,064	1,029,680
Property and equipment, net	152,507	159,708
Goodwill	545,668	551,196
Other intangible assets, net	35,662	43,161
Long-term deferred tax assets	29,026	32,032
Other assets	9,667	13,809
Total assets	1,606,594	1,829,586
Current liabilities:
Accounts payable	18,284	12,009
Accrued liabilities	56,964	60,404
Accrued compensation and related expenses	67,062	88,336
Income taxes payable	0	6,895
Deferred revenues	331,660	324,296
Total current liabilities	473,970	491,940
Long-term deferred revenues	17,661	14,679
Long-term income taxes payable	29,262	30,350
Other liabilities	3,578	3,666
Total liabilities	$ 524,471	$ 540,635
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $0.001 par value; 200,000 shares authorized; 104,063 shares and 108,704 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	$ 104	$ 109
Additional paid-in capital	535,685	773,419
Accumulated other comprehensive loss	(41,316)	(31,789)
Retained earnings	587,650	547,212
Total stockholders’ equity	1,082,123	1,288,951
Total liabilities and stockholders' equity	$ 1,606,594	$ 1,829,586