Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividend declared (in dollars per share)	$ 0.4400	$ 0.4050	$ 0.4050	$ 0.3700	$ 0.8450	$ 0.7750
Deferred compensation plan held Rabbi Trust (shares)	107,141		105,409		107,141	105,409	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