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Note 18 - Quarterly Financial Information (Unaudited) (Details) - Unaudited Quarterly Financial Information (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unaudited Quarterly Financial Information [Abstract]
Net sales	$ 403,997us-gaap_SalesRevenueNet	$ 352,305us-gaap_SalesRevenueNet	$ 362,609us-gaap_SalesRevenueNet	$ 342,008us-gaap_SalesRevenueNet	$ 376,236us-gaap_SalesRevenueNet	$ 363,269us-gaap_SalesRevenueNet	$ 346,688us-gaap_SalesRevenueNet	$ 399,572us-gaap_SalesRevenueNet	$ 1,460,919us-gaap_SalesRevenueNet	$ 1,485,765us-gaap_SalesRevenueNet	$ 1,176,306us-gaap_SalesRevenueNet
Gross profit	138,410us-gaap_GrossProfit	130,283us-gaap_GrossProfit	128,012us-gaap_GrossProfit	119,514us-gaap_GrossProfit	145,682us-gaap_GrossProfit	139,463us-gaap_GrossProfit	130,953us-gaap_GrossProfit	153,462us-gaap_GrossProfit	516,219us-gaap_GrossProfit	569,560us-gaap_GrossProfit	440,400us-gaap_GrossProfit
Operating income	79,115us-gaap_OperatingIncomeLoss	70,794us-gaap_OperatingIncomeLoss	78,160us-gaap_OperatingIncomeLoss	65,306us-gaap_OperatingIncomeLoss	91,218us-gaap_OperatingIncomeLoss	87,289us-gaap_OperatingIncomeLoss	76,433us-gaap_OperatingIncomeLoss	96,525us-gaap_OperatingIncomeLoss	293,375us-gaap_OperatingIncomeLoss	351,465us-gaap_OperatingIncomeLoss	223,555us-gaap_OperatingIncomeLoss
Net income	$ 49,390us-gaap_NetIncomeLoss	$ 36,497us-gaap_NetIncomeLoss	$ 54,025us-gaap_NetIncomeLoss	$ 34,701us-gaap_NetIncomeLoss	$ 48,518us-gaap_NetIncomeLoss	$ 47,093us-gaap_NetIncomeLoss	$ 28,254us-gaap_NetIncomeLoss	$ 50,674us-gaap_NetIncomeLoss	$ 174,613us-gaap_NetIncomeLoss	$ 174,539us-gaap_NetIncomeLoss	$ 93,223us-gaap_NetIncomeLoss
Net income per common share, basic: (in Dollars per share)	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.75us-gaap_EarningsPerShareBasic	$ 2.55us-gaap_EarningsPerShareBasic	$ 2.56us-gaap_EarningsPerShareBasic	$ 1.38us-gaap_EarningsPerShareBasic
Net income per common share, diluted: (in Dollars per share)	$ 0.70us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 2.49us-gaap_EarningsPerShareDiluted	$ 2.51us-gaap_EarningsPerShareDiluted	$ 1.35us-gaap_EarningsPerShareDiluted

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