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Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 679,617 | $ 554,339
Other comprehensive income before reclassifications | 769 | 2,873
Amounts reclassified from other comprehensive income (loss), net of tax | (417) | (199)
Net current-period other comprehensive income (loss), net of tax | 352 | 2,674
Unrealized gains (losses) on interest rate swap contracts | (317) | 202
Ending balance | 730,485 | 574,502
Foreign currency translation adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (11,274) | (6,954)
Other comprehensive income before reclassifications | 669 | 2,472
Amounts reclassified from other comprehensive income (loss), net of tax | 0 | 0
Net current-period other comprehensive income (loss), net of tax | 669 | 2,472
Ending balance | (10,605) | (4,482)
Unrealized gain (loss) on interest rate swap hedges |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 420 | 841
Other comprehensive income before reclassifications | 100 | 401
Amounts reclassified from other comprehensive income (loss), net of tax | (417) | (199)
Net current-period other comprehensive income (loss), net of tax | (317) | 202
Ending balance | 103 | 1,043
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (10,854) | (6,113)
Ending balance | $ (10,502) | $ (3,439)

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