Certain Balance Sheet Components Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Accounts Receivable, Net (Line Items]
Trade receivables (net of allowance of $5,949 and $6,195)	$ 298,550				$ 321,309
Unbilled receivables	32,345				25,238
Total accounts receivable, net	$ 330,895	$ 340,423	$ 338,196	$ 324,706	$ 346,547	$ 342,480	$ 369,092	$ 341,547