Balance Sheet Accounts (Narratives) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									0 Months Ended	12 Months Ended
	Dec. 31, 2012 Investment_Securities	Jan. 01, 2012	Dec. 31, 2012 Investment_Securities	Jan. 01, 2012	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum	Dec. 31, 2012 Cash Equivalents Maximum	Dec. 31, 2012 Short-term Investments Minimum	Dec. 31, 2012 Short-term Investments Maximum	Dec. 31, 2012 Marketable Securities Minimum	Dec. 31, 2012 Available-for-sale Securities Government and Corporate Debt Securities	Sep. 11, 2012 Santa Clara Headquarters acre	Jun. 30, 2012 Customer Concentration Risk Accounts Receivable Minimum
Balance Sheet Accounts [Line Items]
Maturity period for investments							3 months	3 months	1 year	1 year	3 years
Number of securities with unrealized losses	13		13
Number of investment securities	64		64
Number of acres of land sold												16
Net cash proceeds from sale of real estate			$ 42,659	$ 0								$ 44,700
Gain on sale of property	0	0	11,539	0								11,500
Amortization expense	$ 400	$ 500	$ 801	$ 1,030
Extended warranty contracts period					1 year	5 years
Standard hardware warranty period			12 months
Standard software warranty period			90 days
Limited lifetime hardware warranty maximum period after end of sale of product			5 years
Maximum investment in one obligor or maker (percent)			10.00%
Concentration risk													10.00%