Other Balance Sheet Items Other Balance Sheet Items (Long-term tax and other liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Long-term tax and other liabilities Disclosure [Abstract]
Unrecognized Tax Benefits		$ 126,890	$ 308,112
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	$ 167,800	167,800
Operating Lease, Liability, Noncurrent		4,755	4,564
Other long-term liabilities		$ 131,645	$ 312,676