CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Issuance of common stock (in shares)	91,274	84,164
Issuance of common stock purchased under the employee stock purchase plan (in shares)	1,712	1,929
Forfeiture of common stock (in shares)	443	703
Cash dividends (in dollars per share)	$ 0.89	$ 0.82
Purchase of common stock (in shares)	68,881	69,771