Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash	$ 2,501,504	$ 2,072,296
Cash and Cash Equivalents	3,067,534	2,822,795
Non-current Assets, Cash	9,739	4,367
Restricted Cash and Cash Equivalents	11,030	5,643
Cash and Restricted Cash	2,511,243	2,076,663
Total Cash, cash equivalents, and restricted cash and cash equivalents		2,828,438
Fair Value, Measurements, Recurring \| Level 1 Securities \| Money market funds
Cash and Cash Equivalents [Line Items]
Money market funds	566,030	449,734
Fair Value, Measurements, Recurring \| Level 2 Securities
Cash and Cash Equivalents [Line Items]
Time Deposits		300,765
Money market funds \| Fair Value, Measurements, Recurring \| Level 1 Securities
Cash and Cash Equivalents [Line Items]
Non-current Assets, Securities	1,291	1,276
Cash Equivalents and Restricted Cash Equivalents	$ 567,321	451,010
Bank Time Deposits \| Fair Value, Measurements, Recurring \| Level 2 Securities
Cash and Cash Equivalents [Line Items]
Non-current Assets, Securities		0
Cash Equivalents and Restricted Cash Equivalents		$ 300,765

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Cash, Cash Equivalents And Restricted Cash

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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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.

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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.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, 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.

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Amount of cash equivalents restricted as to withdrawal or usage. Cash equivalents include, but are not limited to, short-term, 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.

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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.

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