Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 887,461	$ 773,242	$ 845,254	$ 679,617
Other comprehensive income (loss) before reclassifications	3,510	(2,825)	(733)	(2,979)
Amounts reclassified from other comprehensive income (loss), net of tax	0	0	0	(568)
Net current-period other comprehensive income (loss), net of tax	3,510	(2,825)	(733)	(3,547)
Ending balance	918,399	807,533	918,399	807,533
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(13,689)	(11,576)	(9,446)	(10,854)
Ending balance	(10,179)	(14,401)	(10,179)	(14,401)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(13,689)	(11,576)	(9,446)	(11,274)
Other comprehensive income (loss) before reclassifications	3,510	(2,825)	(733)	(3,127)
Amounts reclassified from other comprehensive income (loss), net of tax	0	0	0	0
Net current-period other comprehensive income (loss), net of tax	3,510	(2,825)	(733)	(3,127)
Ending balance	(10,179)	(14,401)	(10,179)	(14,401)
Unrealized gain (loss) on interest rate swap hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0	0	420
Other comprehensive income (loss) before reclassifications	0	0	0	148
Amounts reclassified from other comprehensive income (loss), net of tax	0	0	0	(568)
Net current-period other comprehensive income (loss), net of tax	0	0	0	(420)
Ending balance	$ 0	$ 0	$ 0	$ 0