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Quarterly Financial Information (Unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 326,770,000 | $ 288,622,000 | $ 286,974,000 | $ 269,499,000 | $ 260,349,000 | $ 268,248,000 | $ 280,256,000 | $ 290,707,000 | $ 1,171,864,171 | $ 1,099,559,521 | $ 1,023,762,049
Gross Profit | 128,694,000 | 105,962,000 | 102,613,000 | 93,464,000 | 89,119,000 | 90,116,000 | 92,757,000 | 100,826,000 | 430,732,902 | 372,818,559 | 361,580,335
Operating Income | 95,636,000 | 73,656,000 | 71,596,000 | 63,854,000 | 53,819,000 | 57,623,000 | 57,512,000 | 65,501,000 | 304,741,813 | 234,455,232 | 231,367,925
Net Income | $ 69,881,000 | $ 55,521,000 | $ 52,097,000 | $ 45,431,000 | $ 39,599,000 | $ 41,877,000 | $ 40,767,000 | $ 46,345,000 | $ 222,929,949 | $ 168,586,840 | $ 164,668,228
Earnings Per Share (Diluted) (in dollars per share) | $ 0.48 | $ 0.38 | $ 0.36 | $ 0.32 | $ 0.28 | $ 0.29 | $ 0.28 | $ 0.32 | $ 1.55 | $ 1.17 | $ 1.14
Earnings Per Share (Basic) (in dollars per share) | $ 0.48 | $ 0.39 | $ 0.36 | $ 0.32 | $ 0.28 | $ 0.29 | $ 0.28 | $ 0.32 | $ 1.55 | $ 1.18 | $ 1.16

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