Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 3,044,310	$ 2,910,420
Short-term investments	394,507	641,323
Accounts receivable, net of allowances	406,756	577,386
Deferred tax assets, net	177,412	154,310
Prepaid expenses and other current assets	206,771	156,222
Total current assets	4,229,756	4,439,661
Property and equipment, net	711,953	598,581
Long-term investments	832,966	740,659
Restricted cash and investments	82,002	78,307
Purchased intangible assets, net	143,774	123,114
Goodwill	3,987,707	3,928,144
Other long-term assets	58,123	75,354
Total assets	10,046,281	9,983,820
Current liabilities:
Accounts payable	199,563	324,843
Accrued compensation	245,331	223,018
Accrued warranty	29,776	28,276
Deferred revenue	773,275	712,663
Income taxes payable	24,942	12,545
Other accrued liabilities	180,377	165,358
Total current liabilities	1,453,264	1,466,703
Long-term debt	999,108	999,034
Long-term deferred revenue	219,617	254,364
Long-term income taxes payable	108,178	108,471
Other long-term liabilities	57,191	65,590
Juniper Networks stockholders' equity:
Convertible preferred stock, $0.00001 par value; 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value; 1,000,000 shares authorized; 526,122 shares and 526,409 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	5	5
Additional paid-in capital	10,154,457	10,079,169
Accumulated other comprehensive loss	(8,362)	(17,590)
Accumulated deficit	(2,937,653)	(2,972,402)
Total Juniper Networks stockholders' equity	7,208,447	7,089,182
Noncontrolling interest	476	476
Total equity	7,208,923	7,089,658
Total liabilities and stockholders' equity	$ 10,046,281	$ 9,983,820