Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

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:

	December 31, 2020				December 31, 2019
	Cost		Fair Value		Cost		Fair Value
Cash and cash equivalents:
Cash and overnight deposits	$	602,112	$	602,112	$	417,456	$	417,456
Corporate commercial paper		872,287		872,350		775,504		776,356
Time deposits		53,392		53,392		37,531		37,531
Total cash and cash equivalents	$	1,527,791	$	1,527,854	$	1,230,491	$	1,231,343