Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

	Common Stock
	Treasury	Outstanding
	(Number of Shares)
Balance at end of 2017	775,203	10,340,576
Issued for stock-based compensation plans	(25,431)	25,431
Balance at end of 2018	749,772	10,366,007
Issued for stock-based compensation plans	(56,084)	56,084
Balance at end of 2019	693,688	10,422,091
Issued for stock-based compensation plans	(141,199)	141,199
Balance at end of 2020	552,489	10,563,290