Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.00	$ 0.00	$ 0.54	$ 0.52
Purchase of treasury shares (in shares)			263,507
Net issuance of shares to employee benefit plans and other stock plans (in shares)	20,905	29,525	75,246	96,445