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Balance Sheet Components - Other Non-Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Deferred income taxes $ 7,638 $ 7,360
Other non-current liabilities 7,742 4,667
Deferred compensation liability 4,874 4,409
Total $ 20,254 $ 16,436