Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	May 04, 2018	Dec. 31, 2017
Cash dividends paid per common share	$ 0.23	$ 0.22	$ 0.22	$ 0.21	$ 0.45	$ 0.43
Common stock, par value (in dollars per share)	$ 0.01			$ 1.00	$ 0.01		$ 0.01	$ 0.01	$ 1.00