CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Purchase of treasury stock (in shares)	143,092	186,417	260,621	75,765
Issuance of treasury stock (in shares)		2,822	102,856	223,971
Cancellations of treasury stock (in shares)	41	19,433		5,214
Dividends, per share (in dollars per share)	$ 0.2	$ 0.20	$ 0.19	$ 0.19