Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.27	$ 0.00	$ 0.81	$ 0.54
Purchase of treasury shares (in shares)	23,627		280,658	263,507
Net issuance of shares to employee benefit plans and other stock plans (in shares)	53,788	20,905	106,927	75,246