Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 529,864,000	$ 474,639,000	$ 229,926,000	$ 453,762,000	$ 443,836,000	$ 477,761,000	$ 468,711,000	$ 468,589,000	$ 1,688,189,405		$ 1,858,897,406		$ 1,834,063,697
Gross Profit	216,675,000	188,237,000	43,945,000	156,587,000	161,805,000	180,321,000	176,538,000	169,645,000	605,443,520		688,307,969		690,466,692
Operating Income (Loss)	162,414,000	138,853,000	(6,738,000)	105,027,000	110,901,000	128,136,000	127,905,000	121,596,000	399,556,092		488,537,604		508,125,547
Net income	$ 143,339,000	$ 117,093,000	$ (2,374,000)	$ 89,506,000	$ 99,547,000	$ 111,898,000	$ 108,959,000	$ 104,280,000	$ 347,563,621		$ 424,683,939		$ 437,883,097
Earnings (Loss) Per Share (Basic) (in dollars per share)	$ 0.58	$ 0.48	$ (0.01)	$ 0.36	$ 0.39	$ 0.44	$ 0.42	$ 0.40	$ 1.41	[1]	$ 1.67	[1]	$ 1.64	[1]
Earnings (Loss) Per Share (Diluted) (in dollars per share)	$ 0.59	$ 0.48	$ (0.01)	$ 0.36	$ 0.39	$ 0.44	$ 0.42	$ 0.40	$ 1.41	[1]	$ 1.66	[1]	$ 1.62	[1]

[1] (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards