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Cash and Available-for-Sale Securities - (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash and Cash Equivalents and Investments
Cash, cash equivalents and investments consisted of the following (in thousands): 
September 30, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Cash and
Cash
Equivalents		Investments
Cash$406,338 $— $— $406,338 $406,338 $— 
Time deposits1,255,000 — — 1,255,000 80,000 1,175,000 
Money market funds255,604 — — 255,604 255,604 — 
Totals$1,916,942 $— $— $1,916,942 $741,942 $1,175,000 
December 31, 2019
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Cash and
Cash
Equivalents		Investments
Cash$333,172 $— $— $333,172 $333,172 $— 
Time deposits460,000 — — 460,000 20,000 440,000 
Money market funds284,172 — — 284,172 284,172 — 
Totals$1,077,344 $— $— $1,077,344 $637,344 $440,000