Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 878,500	$ 730,485	$ 845,254	$ 679,617
Other comprehensive income (loss) before reclassifications	451	(923)	(4,243)	(154)
Amounts reclassified from other comprehensive income (loss), net of tax	0	(151)	0	(568)
Net current-period other comprehensive income (loss), net of tax	451	(1,074)	(4,243)	(722)
Ending balance	887,461	773,242	887,461	773,242
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14,140)	(10,502)	(9,446)	(10,854)
Ending balance	(13,689)	(11,576)	(13,689)	(11,576)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14,140)	(10,605)	(9,446)	(11,274)
Other comprehensive income (loss) before reclassifications	451	(971)	(4,243)	(302)
Amounts reclassified from other comprehensive income (loss), net of tax	0	0	0	0
Net current-period other comprehensive income (loss), net of tax	451	(971)	(4,243)	(302)
Ending balance	(13,689)	(11,576)	(13,689)	(11,576)
Unrealized gain (loss) on interest rate swap hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	103	0	420
Other comprehensive income (loss) before reclassifications	0	48	0	148
Amounts reclassified from other comprehensive income (loss), net of tax	0	(151)	0	(568)
Net current-period other comprehensive income (loss), net of tax	0	(103)	0	(420)
Ending balance	$ 0	$ 0	$ 0	$ 0