Consolidated Statements of Shareholders Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per share	$ 0.16	$ 0.16	$ 0.16
Treasury stock, shares, acquired	342,731	420,770	342,100