Quarterly Data

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Data (Unaudited) [Text Block]

22. Quarterly Data (Unaudited)

					Continuing Operations						Net Earnings
Quarter	Revenue		Gross Profit		Earnings		Per Share - Basic		Per Share - Diluted		Net Earnings		Per Share - Basic		Per Share - Diluted
2019
First	$	1,724,757	$	623,542	$	105,705	$	0.73	$	0.72	$	105,705	$	0.73	$	0.72
Second	1,810,706		672,593		198,085		1.36		1.35		198,085		1.36		1.35
Third	1,825,345		673,488		206,006		1.42		1.40		206,006		1.42		1.40
Fourth	1,775,589		651,315		168,122		1.16		1.15		168,122		1.16		1.15
	$	7,136,397	$	2,620,938	$	677,918	$	4.67	$	4.61	$	677,918	$	4.67	$	4.61
2018
First	$	1,637,671	$	602,828	$	109,409	$	0.71	$	0.70	$	131,434	$	0.85	$	0.84
Second	1,798,094		665,236		166,456		1.10		1.08		139,959		0.92		0.91
Third	1,747,403		646,520		157,305		1.07		1.05		157,305		1.07		1.05
Fourth	1,808,950		644,972		157,975		1.08		1.07		141,569		0.97		0.96
	$	6,992,118	$	2,559,556	$	591,145	$	3.94	$	3.89	$	570,267	$	3.80	$	3.75