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Foreign Operations - Long-Lived Tangible Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 96,290 $ 100,455
United States    
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 12,972 14,504
People's Republic of China (PRC)    
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets 69,412 79,382
All other countries    
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 13,906 $ 6,569