Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Los Gatos Buildings [Member]	Mar. 31, 2010 Los Gatos Buildings [Member] Y
Commitments and Contingencies [Line Items]
Total costs of buildings and improvements	$ 40,700,000
Extended lease term					5
Operating leases, increase in future minimum payments due					14,000,000
Lease financing obligation				31,800,000
Current portion of lease financing obligation in accrued expenses				1,200,000
Non-current portion of lease financing obligation in other non-current liabilities				30,600,000
Operating leases, remaining future minimum payments due				15,100,000
Operating lease financing obligation under extended lease term				25,800,000
Rent expense	29,700,000	16,900,000	14,900,000
Total streaming content obligations	5,633,685,000	4,822,994,000
Lease term				10 years
Total minimum payments	$ 139,358,000			$ 63,400,000