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Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 554,341 |
Other comprehensive income (loss) before reclassifications | $ (817) | $ 1,424 | (2,163) | $ 3,499
Amounts reclassified from other comprehensive income (loss), net of tax | (324) | (109) | (808) | (156)
Net current-period other comprehensive income (loss), net of tax | (1,141) | 1,315 | (2,971) | 3,343
Unrealized losses on interest rate swap contracts | (234) | (74) | (122) | (45)
Ending balance | 619,239 |  | 619,239 |
Foreign currency translation adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (8,896) | (8,765) | (6,954) | (10,764)
Other comprehensive income (loss) before reclassifications | (907) | 1,389 | (2,849) | 3,388
Amounts reclassified from other comprehensive income (loss), net of tax | 0 | 0 | 0 | 0
Net current-period other comprehensive income (loss), net of tax | (907) | 1,389 | (2,849) | 3,388
Ending balance | (9,803) | (7,376) | (9,803) | (7,376)
Unrealized gain (loss) on interest rate swap hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 953 | 1,274 | 841 | 1,245
Other comprehensive income (loss) before reclassifications | 90 | 35 | 686 | 111
Amounts reclassified from other comprehensive income (loss), net of tax | (324) | (109) | (808) | (156)
Net current-period other comprehensive income (loss), net of tax | (234) | (74) | (122) | (45)
Ending balance | 719 | 1,200 | 719 | 1,200
AOCI Attributable to Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (7,943) | (7,491) | (6,113) | (9,519)
Ending balance | $ (9,084) | $ (6,176) | $ (9,084) | $ (6,176)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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=114867106&loc=SL7669686-108580 + Details
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