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Balance Sheet Information (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2008
Intangible Assets |  |  |
Gross intangible assets | $ 128,883 | $ 121,207 |
Less accumulated amortization | (103,001) | (104,314) |
Intangible assets, net | 25,882 | 16,893 |
Estimated aggregate amortization expense |  |  |
2012 | 4,538 |  |
2013 | 3,286 |  |
2014 | 2,961 |  |
2015 | 2,859 |  |
2016 | 2,671 |  |
Accrued Expenses |  |  |
Payroll and related benefits | 19,017 | 27,374 |
Sales, use, income and other taxes | 6,315 | 4,914 |
Customer deposits and advanced billings | 57,075 | 129,225 |
Warranty | 9,778 | 9,238 |
Restructuring liability | 956 | 714 | 2,165
Other | 14,515 | 11,545 |
Total | 107,656 | 183,010 |
Accrued Warranty |  |  |
Balance as of the beginning of period | 9,238 | 6,675 |
Warranties issued during the period | 12,465 | 9,695 |
Settlements made during the period | (11,925) | (7,132) |
Balance as of the end of period | 9,778 | 9,238 |
Purchased technology |  |  |
Intangible Assets |  |  |
Gross intangible assets | 109,248 | 98,473 |
Less accumulated amortization | (89,620) | (86,376) |
Intangible assets, net | 19,628 | 12,097 |
Other intangible assets |  |  |
Intangible Assets |  |  |
Gross intangible assets | 19,635 | 22,734 |
Less accumulated amortization | (13,381) | (17,938) |
Intangible assets, net | $ 6,254 | $ 4,796 |

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