Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividend declared (in dollars per share)	$ 0.4400	$ 0.4400	$ 0.4050	$ 0.4050	$ 0.4050	$ 0.3700	$ 1.285	$ 1.18
Deferred compensation plan held Rabbi Trust (shares)	104,119			94,923			104,119	94,923	95,329	97,053
Preferred Stock, Shares Authorized	2,000,000						2,000,000		2,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01						$ 0.01		$ 0.01
Shares issued under the performance incentive plan withheld for employee taxes (shares)							10,319	7,635