Balance Sheet Components - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 431,607
Other comprehensive income (loss) before reclassifications	$ 976	$ (4,467)	2,075	$ (4,794)
Amounts reclassified from other comprehensive income (loss), net of tax	(53)	0	(47)	0
Net current-period other comprehensive income (loss), net of tax	923	(4,467)	2,028	(4,794)
Ending balance	449,502		449,502
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9,841)	(3,057)	(10,764)	(2,730)
Other comprehensive income (loss) before reclassifications	1,076	(4,467)	1,999	(4,794)
Amounts reclassified from other comprehensive income (loss), net of tax	0	0	0	0
Net current-period other comprehensive income (loss), net of tax	1,076	(4,467)	1,999	(4,794)
Ending balance	(8,765)	(7,524)	(8,765)	(7,524)
Unrealized gain (loss) on interest rate swap hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,427	0	1,245	0
Other comprehensive income (loss) before reclassifications	(100)	0	76	0
Amounts reclassified from other comprehensive income (loss), net of tax	(53)	0	(47)	0
Net current-period other comprehensive income (loss), net of tax	(153)	0	29	0
Ending balance	1,274	0	1,274	0
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,414)	(3,057)	(9,519)	(2,730)
Ending balance	$ (7,491)	$ (7,524)	$ (7,491)	$ (7,524)