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Derivatives - Foreign Currency Exchange Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 USD ($) $ / ¥ $ / € $ / R$ | Dec. 31, 2018 USD ($) $ / ¥ $ / € $ / R$
USD/Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value | $ 33,000 |
Forward rate | $ / ¥ | 7.1253 |
Unrealized gain/(loss) recorded at balance sheet date | $ (71) |
USD/Chinese Yuan Renminbi | USD/Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value |  | $ 27,000
Forward rate | $ / ¥ |  | 6.8969
Unrealized gain/(loss) recorded at balance sheet date |  | $ (116)
USD/Chinese Yuan Renminbi | USD/Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value |  | $ 5,000
Forward rate | $ / ¥ |  | 6.9245
Unrealized gain/(loss) recorded at balance sheet date |  | $ (41)
USD/Brazilian Real |  |
Derivative [Line Items] |  |
Notional value | $ 1,000 | $ 1,000
Forward rate | $ / R$ | 4.1565 | 3.8651
Unrealized gain/(loss) recorded at balance sheet date | $ (3) | $ 5
USD/Euro |  |
Derivative [Line Items] |  |
Notional value | $ 29,000 | $ 20,000
Forward rate | $ / € | 1.0971 | 1.1421
Unrealized gain/(loss) recorded at balance sheet date | $ 131 | $ (97)

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