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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019

 

 

December 31, 2018

 

 

 

 

Cost

 

 

Fair Value

 

 

Cost

 

 

Fair Value

 

 

Cash and cash equivalents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash and overnight deposits

 

$

417,456

 

 

$

417,456

 

 

$

427,307

 

 

$

427,307

 

 

Corporate commercial paper

 

 

775,504

 

 

 

776,356

 

 

 

467,300

 

 

 

467,760

 

 

Time deposits

 

 

37,531

 

 

 

37,531

 

 

 

29,128

 

 

 

29,128

 

 

Total cash and cash equivalents

 

$

1,230,491

 

 

$

1,231,343

 

 

$

923,735

 

 

$

924,195