Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Cash and Cash Equivalents by Balance Sheet Grouping

Cash and cash equivalents consist of the following:

	March 31, 2021				December 31, 2020
	Cost		Fair Value		Cost		Fair Value
Cash and Cash Equivalents:
Cash and overnight deposits	$	792,947	$	792,947	$	602,112	$	602,112
Corporate commercial paper		938,412		938,471		872,287		872,350
Time deposits		62,034		62,034		53,392		53,392
Total cash and cash equivalents	$	1,793,393	$	1,793,452	$	1,527,791	$	1,527,854