CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 134,879	$ 163,198
Short-term investments	83,527	108,216
Trade accounts receivable, net of allowances for doubtful accounts and sales returns	26,494	30,754
Deferred costs, current portion	1,622	825
Deferred Tax Assets, Net of Valuation Allowance, Current	3,942	2,869
Prepaid expenses and other current assets	12,152	17,002
Total current assets	262,616	322,864
Equipment, software, and leasehold improvements, at cost:
Equipment and software	94,054	98,041
Leasehold improvements	3,516	22,767
Total equipment, software, and leasehold improvements, at cost	97,570	120,808
Less accumulated depreciation and amortization	73,105	91,492
Net equipment, software, and leasehold improvements	24,465	29,316
Restricted cash equivalents and investments	5,000	10,000
Equity method investments	12,656	19,204
Available for sale securities	34,485	34,334
Other assets	2,844	3,153
Deferred costs, non-current portion	1,032	531
Deferred tax assets, net, non-current portion	1,576	4,911
Intangible Assets, Net (Excluding Goodwill)	14,051	3,275
Goodwill	17,518	6,309
Total assets	376,243	433,897
Current liabilities:
Accounts payable	20,562	19,013
Accrued and other liabilities	58,024	57,530
Deferred revenue, current portion	7,604	8,675
Total current liabilities	86,190	85,218
Deferred revenue, non-current portion	167	169
Deferred rent	613	2,250
Deferred tax liabilities, net, non-current portion	3,166	432
Other long-term liabilities	492	3,100
Total liabilities	90,628	91,169
Commitments and contingencies
Preferred stock, $0.001 par value, no shares issued and outstanding:
Common stock, $0.001 par value authorized 250,000 shares; issued and outstanding 35,198 shares in 2012 and 34,422 shares in 2011	36	35
Additional paid-in capital	608,595	603,770
Accumulated other comprehensive loss	(26,959)	(26,540)
Retained deficit	(296,057)	(234,537)
Total shareholders' equity	285,615	342,728
Total liabilities and shareholders' equity	376,243	433,897
Preferred stock, Series A
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	0	0
Preferred stock, Undesignated series
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	$ 0	$ 0