Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 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:

	March 31, 2020				December 31, 2019
	Cost		Fair Value		Cost		Fair Value
Cash and Cash Equivalents:
Cash and overnight deposits	$	440,121	$	440,121	$	417,456	$	417,456
Corporate commercial paper		635,697		636,169		775,504		776,356
Time deposits		36,155		36,155		37,531		37,531
Total cash and cash equivalents	$	1,111,973	$	1,112,445	$	1,230,491	$	1,231,343