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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds | $ 0 | $ 585,000,000
Time Deposits |  | 24,482,000
Fair Value, Measurements, Recurring | Quoted prices in active markets (Level 1) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds |  | 0
Time Deposits | 0 | 0
Trading Securities | 10,248,000 | 11,279,000
Derivative Assets | 0 | 0
Derivative Liabilities |  | 0
Interest Rate Swap Agreements Liabilities | 0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds |  | 585,000,000
Time Deposits | 956,000 | 24,482,000
Trading Securities | 505,000 | 505,000
Derivative Assets | 93,000 | 1,579,000
Derivative Liabilities |  | 2,329,000
Interest Rate Swap Agreements Liabilities | 973,000 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds |  | 0
Time Deposits | 0 | 0
Trading Securities | 0 | 0
Derivative Assets | 0 | 0
Derivative Liabilities |  | 0
Interest Rate Swap Agreements Liabilities | 0 |
Fair Value, Measurements, Recurring | Estimated Fair Value |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Money Market Funds |  | 585,000,000
Time Deposits | 956,000 | 24,482,000
Trading Securities | 10,753,000 | 11,784,000
Derivative Assets | 93,000 | 1,579,000
Derivative Liabilities |  | $ 2,329,000
Interest Rate Swap Agreements Liabilities | $ 973,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + 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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