Other Balance Sheet Items Other Balance Sheet Items (Long-term tax and other liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-term tax and other liabilities Disclosure [Abstract]
other tax liabilities, noncurrent	$ 96,190	$ 308,112
Operating Lease, Liability, Noncurrent	5,016	4,564
Other long-term liabilities	$ 101,206	$ 312,676