Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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.

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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.

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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.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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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