Quarterly Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Data [Table Text Block]

	Continuing Operations										Net Earnings
Quarter	Revenue		Gross Profit		Earnings		Per Share - Basic		Per Share - Diluted		Net Earnings		Per Share - Basic		Per Share - Diluted
2016
First	$	1,622,273	$	589,264	$	99,356	$	0.64	$	0.64	$	99,356	$	0.64	$	0.64
Second	1,686,345		631,213		118,290		0.76		0.76		118,290		0.76		0.76
Third	1,707,763		631,788		130,084		0.84		0.83		130,084		0.84		0.83
Fourth	1,777,961		619,704		161,162		1.04		1.03		161,162		1.04		1.03
	$	6,794,342	$	2,471,969	$	508,892	$	3.28	$	3.25	$	508,892	$	3.28	$	3.25
2015
First	$	1,715,501	$	627,159	$	117,190	$	0.72	$	0.72	$	209,510	$	1.30	$	1.28
Second	1,758,628		654,568		155,634		0.98		0.97		332,396		2.10		2.07
Third	1,787,582		672,608		186,483		1.20		1.19		186,098		1.20		1.19
Fourth	1,694,600		613,809		136,574		0.88		0.87		141,825		0.92		0.91
	$	6,956,311	$	2,568,144	$	595,881	$	3.78	$	3.74	$	869,829	$	5.52	$	5.46