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Quarterly Results of Operations (unaudited) (Table) (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2012
First Quarter [Member]
Mar. 31, 2011
First Quarter [Member]
Jun. 30, 2012
Second Quarter [Member]
Jun. 30, 2011
Second Quarter [Member]
Sep. 30, 2012
Third Quarter [Member]
Sep. 30, 2011
Third Quarter [Member]
Dec. 31, 2012
Fourth Quarter [Member]
Dec. 31, 2011
Fourth Quarter [Member]
Net sales $ 1,227,072,000 $ 968,549,000 $ 635,418,000 $ 265,970,000 $ 165,755,000 $ 288,692,000 $ 209,152,000 $ 356,883,000 $ 313,887,000 $ 315,527,000 $ 279,755,000
Cost of sales 771,370,000 606,601,000 359,564,000 169,877,000 96,623,000 184,438,000 125,057,000 225,668,000 204,434,000 191,387,000 180,487,000
Gross profit 455,702,000 361,948,000 275,854,000 96,093,000 69,132,000 104,254,000 84,095,000 131,215,000 109,453,000 124,140,000 99,268,000
Fees and Commissions       4,473,000 4,567,000 4,252,000 4,432,000 3,875,000 5,649,000 2,795,000 4,067,000
Net Income (Loss) Attributable to Parent $ 119,626,000 $ 97,319,000 $ 75,725,000 $ 21,868,000 $ 17,852,000 $ 26,899,000 $ 23,784,000 $ 37,896,000 $ 31,911,000 $ 32,963,000 $ 23,772,000
Net income per share: [Abstract]                      
Earnings Per Share, Basic $ 2.78 $ 2.30 $ 1.83 $ 0.51 $ 0.43 $ 0.63 $ 0.56 $ 0.88 $ 0.75 $ 0.76 $ 0.56
Earnings Per Share, Diluted $ 2.71 $ 2.25 $ 1.78 $ 0.50 $ 0.42 $ 0.61 $ 0.55 $ 0.86 $ 0.74 $ 0.74 $ 0.55