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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]



	First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2016
Net sales	$	539,674			$	608,286			$	650,598			$	709,699
Gross profit	299,907				347,576				369,494				418,610
Net earnings	$	65,674			$	79,588			$	101,332			$	137,776
Basic earnings per common share:
Net earnings	$	2.44			$	2.99			$	3.84			$	5.27
Weighted average number of common shares	26,931,293				26,631,015				26,375,468				26,139,024
Diluted earnings per common share:
Net earnings	$	2.40			$	2.93			$	3.77			$	5.17
Weighted average number of common and common equivalent shares	27,421,019				27,143,284				26,888,810				26,631,269
Market price per share:
High	$	347.09			$	385.50			$	419.83			$	429.91
Low	$	298.14			$	347.76			$	363.19			$	397.73

2015
Net sales	$	535,701			$	582,057			$	604,154			$	673,535
Gross profit	298,805				322,912				339,529				390,747
Net earnings	$	63,051			$	77,557			$	88,861			$	123,351
Basic earnings per common share:
Net earnings	$	2.24			$	2.79			$	3.23			$	4.53
Weighted average number of common shares	28,115,220				27,843,905				27,547,734				27,228,026
Diluted earnings per common share:
Net earnings	$	2.19			$	2.73			$	3.16			$	4.44
Weighted average number of common and common equivalent shares	28,762,935				28,460,336				28,113,287				27,755,045
Market price per share:
High	$	331.84			$	343.44			$	346.92			$	345.75
Low	$	289.09			$	317.01			$	277.62			$	283.27