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Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 730,485 | $ 574,504 | $ 679,617 | $ 554,341
Other comprehensive income (loss) before reclassifications | (923) | (4,219) | (154) | (1,346)
Amounts reclassified from other comprehensive income (loss), net of tax | (151) | (285) | (568) | (484)
Net current-period other comprehensive income (loss), net of tax | (1,074) | (4,504) | (722) | (1,830)
Unrealized gains (losses) on interest rate swap contracts | (103) | (90) | (420) | 112
Ending balance | 773,242 | 588,640 | 773,242 | 588,640
Foreign currency translation adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (10,605) | (4,482) | (11,274) | (6,954)
Other comprehensive income (loss) before reclassifications | (971) | (4,414) | (302) | (1,942)
Amounts reclassified from other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0
Net current-period other comprehensive income (loss), net of tax | (971) | (4,414) | (302) | (1,942)
Ending balance | (11,576) | (8,896) | (11,576) | (8,896)
Unrealized gain (loss) on interest rate swap hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 103 | 1,043 | 420 | 841
Other comprehensive income (loss) before reclassifications | 48 | 195 | 148 | 596
Amounts reclassified from other comprehensive income (loss), net of tax | (151) | (285) | (568) | (484)
Net current-period other comprehensive income (loss), net of tax | (103) | (90) | (420) | 112
Ending balance | 0 | 953 | 0 | 953
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (10,502) | (3,439) | (10,854) | (6,113)
Ending balance | $ (11,576) | $ (7,943) | $ (11,576) | $ (7,943)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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