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Foreign Currency Transaction Exposure - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Currency transaction gains (losses), net | $ 62 | $ (6,050) | $ (3,586) | $ (9,558)
Operating income (loss) |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Currency transaction gains (losses), net | 1,316 | (4,482) | (1,782) | (9,023)
Other non-operating expense, net |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Currency transaction gains (losses), net | $ (1,254) | $ (1,568) | $ (1,804) | $ (535)

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