Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
2013
Net sales	$	524,353		$	578,680		$	591,686		$	684,253
Gross profit	279,253			308,843			318,573			375,357
Net earnings	$	52,544		$	69,062		$	74,326		$	110,162
Basic earnings per common share:
Net earnings	$	1.73		$	2.29		$	2.49		$	3.72
Weighted average number of common shares	30,299,569			30,119,889			29,818,218			29,596,949
Diluted earnings per common share:
Net earnings	$	1.69		$	2.24		$	2.43		$	3.63
Weighted average number of common and common equivalent shares	31,101,979			30,849,934			30,579,954			30,366,603
Market price per share:
High	$	221.56		$	228.00		$	242.56		$	253.27
Low	$	196.72		$	197.91		$	205.55		$	233.71
2012
Net sales	$	535,400		$	570,283		$	578,553		$	657,292
Gross profit	277,102			299,008			308,157			356,788
Net earnings	$	52,327		$	61,704		$	72,183		$	104,633
Basic earnings per common share:
Net earnings	$	1.66		$	1.97		$	2.34		$	3.43
Weighted average number of common shares	31,531,915			31,267,660			30,846,062			30,532,491
Diluted earnings per common share:
Net earnings	$	1.62		$	1.93		$	2.28		$	3.35
Weighted average number of common and common equivalent shares	32,386,924			32,038,928			31,599,081			31,271,377
Market price per share:
High	$	189.67	185.08	$	185.08	195.00	$	177.44	185.08	$	195.00
Low	$	152.19	150.57	$	150.57	161.80	$	148.68	150.57	$	161.80