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Quarterly Financial Information (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net Sales $ 405,593,000 $ 389,829,000 $ 379,258,000 $ 368,937,000 $ 350,411,000 $ 350,914,000 $ 338,437,000 $ 335,739,000 $ 1,543,617,706 $ 1,375,501,159 $ 1,171,864,171
Gross Profit 163,244,000 151,897,000 145,543,000 143,092,000 134,673,000 138,626,000 134,292,000 131,299,000 603,776,052 538,889,695 430,732,902
Operating Income 126,662,000 116,263,000 108,133,000 107,709,000 98,615,000 103,206,000 99,835,000 97,178,000 458,766,439 398,834,174 304,741,813
Net Income $ 88,396,000 $ 78,332,000 $ 74,558,000 $ 77,183,000 $ 70,975,000 $ 72,337,000 $ 76,727,000 $ 68,566,000 $ 318,469,859 $ 288,604,579 $ 222,929,949
Earnings Per Share (Diluted) (in dollars per share) $ 0.30 $ 0.27 $ 0.25 $ 0.26 $ 0.24 $ 0.25 $ 0.26 $ 0.24 $ 1.08 $ 0.98 $ 0.77
Earnings Per Share (Basic) (in dollars per share) $ 0.30 $ 0.27 $ 0.25 $ 0.26 $ 0.24 $ 0.25 $ 0.27 $ 0.24 $ 1.09 $ 0.99 $ 0.78