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Other Balance Sheet Items Other Balance Sheet Items (Long-term tax and other liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Long-term tax and other liabilities Disclosure [Abstract]    
Deferred Tax and Other Liabilities, Noncurrent $ 304,187 $ 281,621
Operating Lease, Liability, Noncurrent 4,932 0
Other long-term liabilities $ 309,119 $ 281,621