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Foreign Currency Transaction Gains and Losses - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | $ (6,050) | $ 1,613 | $ (9,558) | $ (39,505)
Operating (loss) income |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | (4,482) | 2,857 | (9,023) | (32,137)
Other non-operating expense, net |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction (losses) gains | $ (1,568) | $ (1,244) | $ (535) | $ (7,368)

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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