Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 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:

	June 30, 2021				December 31, 2020
	Cost		Fair Value		Cost		Fair Value
Cash and Cash Equivalents:
Cash and overnight deposits	$	761,806	$	761,806	$	602,112	$	602,112
Corporate commercial paper		845,471		845,527		872,287		872,350
Time deposits		66,844		66,844		53,392		53,392
Total cash and cash equivalents	$	1,674,121	$	1,674,177	$	1,527,791	$	1,527,854