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Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Thousands | Jun. 30, 2018 USD ($) bank fund | Dec. 31, 2017 USD ($) bank fund
--- | --- | ---
Assets and liabilities carried at fair value measured on a recurring basis |  |
Concentration Risk, Number of "Triple A" Rated Money Market Funds | fund | 0 | 12
Number of global banks with cash, cash equivalent and restricted cash held on deposit | bank | 7 | 7
Fair value measured on recurring basis | Quoted prices in active markets (Level 1) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds, at Carrying Value |  | $ 0
Time Deposits, at Carrying Value | $ 0 | 0
Trading securities | 10,529 | 11,279
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0
Interest Rate Swap | 0 |
Fair value measured on recurring basis | Significant other observable inputs (Level 2) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds, at Carrying Value |  | 585,000
Time Deposits, at Carrying Value | 5,759 | 24,482
Trading securities | 736 | 505
Foreign Currency Contract, Asset, Fair Value Disclosure |  | 1,579
Derivatives Asset | 318 |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 3,413 | 2,329
Interest Rate Swap | 2,203 |
Fair value measured on recurring basis | Significant unobservable inputs (Level 3) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds, at Carrying Value |  | 0
Time Deposits, at Carrying Value | 0 | 0
Trading securities | 0 | 0
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0
Interest Rate Swap | 0 |
Estimate of Fair Value Measurement [Member] | Fair value measured on recurring basis |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds, at Carrying Value |  | 585,000
Time Deposits, at Carrying Value | 5,759 | 24,482
Trading securities | 11,265 | 11,784
Foreign Currency Contract, Asset, Fair Value Disclosure | 318 | 1,579
Foreign Currency Contracts, Liability, Fair Value Disclosure | 3,413 | $ 2,329
Interest Rate Swap | $ 2,203 |

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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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