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Other Financial Information - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Currency exchange adjustments attributable to intercompany loans | $ 3,556 | $ 42,592 | $ (119,473)
Write off of accounts and notes receivable | $ 100,000 | $ 88,000 | $ 83,000

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