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Foreign Currency Transaction Gains and Losses - Summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction losses | $ (11,828) | $ (12,985) | $ (3,508) | $ (41,118)
Operating loss |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction losses | (12,274) | (6,845) | (4,541) | (34,994)
Other non-operating income (expense), net |  |  |  |
Currency Transaction Gains (Losses) [Line Items] |  |  |  |
Net transaction losses | $ 446 | $ (6,140) | $ 1,033 | $ (6,124)

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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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