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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 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 (Unaudited) [Abstract]                      
Net sales $ 376,236 $ 363,269 $ 346,688 $ 399,572 $ 342,022 $ 300,586 $ 239,137 $ 294,561 $ 1,485,765 $ 1,176,306 $ 791,976
Gross profit 145,682 139,463 130,953 153,462 126,153 115,813 87,429 111,005 569,560 440,400 294,654
Operating income 91,218 87,289 76,433 96,525 67,780 59,124 37,158 59,493 351,465 223,555 112,981
Net income $ 48,518 $ 47,093 $ 28,254 $ 50,674 $ 28,287 $ 25,541 $ 9,335 $ 30,060 $ 174,539 $ 93,223 $ 324,643
Net income per common share, basic (in dollars per share) $ 0.71 $ 0.69 $ 0.41 $ 0.75 $ 0.42 $ 0.38 $ 0.14 $ 0.45 $ 2.56 $ 1.38 $ 4.84
Net income per common share, diluted (in dollars per share) $ 0.69 $ 0.67 $ 0.40 $ 0.73 $ 0.41 $ 0.37 $ 0.14 $ 0.44 $ 2.51 $ 1.35 $ 4.79