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Derivative Financial Instruments (Details) $ in Thousands, ₩ in Millions, ¥ in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 KRW (₩) | Dec. 31, 2016 JPY (¥) | Dec. 31, 2016 KRW (₩)
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Unrealized gains/(losses) related to foreign currency cash flow hedges included in accumulated other comprehensive loss | $ 100 | $ 600 |  |  |  |  |
Cumulative translation adjustments included in accumulated other comprehensive loss | (66,400) | (84,700) | $ (71,600) |  |  |  |
Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Fair value | 0 | 500 |  |  |  |  |
Foreign Currency Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Fair value | $ 200 | 900 |  |  |  |  |
Term to recognize gains (losses) in current earnings | 6 months |  |  |  |  |  |
Foreign Currency Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Japanese Yen [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Notional amount | $ 5,500 | 12,000 |  | ¥ 0.6 |  | ¥ 1.4 |
Foreign Currency Forward Contracts [Member] | Other Comprehensive Loss [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Gain (loss) recognized in other comprehensive income loss | (152) | (1,423) | 590 |  |  |  |
Foreign Currency Forward Contracts [Member] | Other Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Korean Won [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Notional amount | 0 | 9,500 |  |  | ₩ 0 |  | ₩ 11,500
Foreign Currency Forward Contracts [Member] | Other Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Gain (loss) recognized in income | (485) | 39 | 38 |  |  |  |
Foreign Currency Forward Contracts [Member] | Revenue [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Gain (loss) reclassified from accumulated other comprehensive loss into income | 119 | (1,088) | 1,731 |  |  |  |
Foreign Currency Forward Contracts [Member] | Selling Expenses [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |  |  |  |  |
Foreign Currency Derivatives [Abstract] |  |  |  |  |  |  |
Gain (loss) reclassified from accumulated other comprehensive loss into income | $ 358 | $ (1,544) | $ 397 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Term to recognize unrealized gains (losses) on derivative contracts included in accumulated other comprehensive income in current earnings, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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