Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended			9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Per share amount of cash dividends declared	$ 0.13		$ 0.13	$ 0.39	$ 0.39
Retained Earnings [Member]
Per share amount of cash dividends declared	$ 0.13	[1]	$ 0.13	$ 0.39	$ 0.39

[1] 0.13