Consolidated Statement Of Shareholders' Equity (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Net income attributable to redeemable noncontrolling interests	$ 470	$ 821	$ 1,627	$ 2,604
Dividends declared to common shareholders (in dollars per share)	$ 1.06	$ 1.05	$ 3.16	$ 3.09