Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets (liabilities):
Stock-based compensation	$ 131,339	$ 100,397
Accruals and reserves	14,367	13,415
Depreciation and amortization	(43,204)	(11,708)
R&D credits	74,091	21,014
Other	3,980	(2,778)
Total deferred tax assets	$ 180,573	$ 120,340