Cash and Available-for-Sale Securities - Summary of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 981,602	$ 1,077,344
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	981,602	1,077,344
Cash and Cash Equivalents	701,602	637,344
Investments	280,000	440,000
Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	226,349	333,172
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	226,349	333,172
Cash and Cash Equivalents	226,349	333,172
Investments	0	0
Time deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	630,000	460,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	630,000	460,000
Cash and Cash Equivalents	350,000	20,000
Investments	280,000	440,000
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	125,253	284,172
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	125,253	284,172
Cash and Cash Equivalents	125,253	284,172
Investments	$ 0	$ 0

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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