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Quarterly Results (Details) (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
Quarterly Results [Abstract]
Revenue	$ 609,600us-gaap_SalesRevenueGoodsGross	$ 638,800us-gaap_SalesRevenueGoodsGross	$ 650,000us-gaap_SalesRevenueGoodsGross	$ 671,100us-gaap_SalesRevenueGoodsGross	$ 1,055,800us-gaap_SalesRevenueGoodsGross	$ 908,300us-gaap_SalesRevenueGoodsGross	$ 671,300us-gaap_SalesRevenueGoodsGross	$ 541,300us-gaap_SalesRevenueGoodsGross	$ 2,569,495us-gaap_SalesRevenueGoodsGross	$ 3,176,718us-gaap_SalesRevenueGoodsGross	$ 2,132,257us-gaap_SalesRevenueGoodsGross
Gross profit	503,100us-gaap_GrossProfit	529,500us-gaap_GrossProfit	494,000us-gaap_GrossProfit	564,400us-gaap_GrossProfit	891,100us-gaap_GrossProfit	768,500us-gaap_GrossProfit	560,000us-gaap_GrossProfit	451,300us-gaap_GrossProfit	2,091,061us-gaap_GrossProfit	2,670,912us-gaap_GrossProfit	1,779,105us-gaap_GrossProfit
Operating income	91,300us-gaap_OperatingIncomeLoss	105,000us-gaap_OperatingIncomeLoss	54,700us-gaap_OperatingIncomeLoss	101,200us-gaap_OperatingIncomeLoss	188,600us-gaap_OperatingIncomeLoss	168,300us-gaap_OperatingIncomeLoss	114,600us-gaap_OperatingIncomeLoss	82,600us-gaap_OperatingIncomeLoss	352,188us-gaap_OperatingIncomeLoss	554,112us-gaap_OperatingIncomeLoss	340,844us-gaap_OperatingIncomeLoss
Net income	$ 46,500us-gaap_NetIncomeLoss	$ 68,300us-gaap_NetIncomeLoss	$ 19,500us-gaap_NetIncomeLoss	$ 54,900us-gaap_NetIncomeLoss	$ 125,300us-gaap_NetIncomeLoss	$ 110,900us-gaap_NetIncomeLoss	$ 74,400us-gaap_NetIncomeLoss	$ 54,300us-gaap_NetIncomeLoss	$ 189,176us-gaap_NetIncomeLoss	$ 364,888us-gaap_NetIncomeLoss	$ 221,645us-gaap_NetIncomeLoss
Net income per share:
Basic (in dollars per share)	$ 0.79us-gaap_EarningsPerShareBasic	$ 1.15us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.93us-gaap_EarningsPerShareBasic	$ 2.13us-gaap_EarningsPerShareBasic	$ 1.89us-gaap_EarningsPerShareBasic	$ 1.27us-gaap_EarningsPerShareBasic	$ 0.93us-gaap_EarningsPerShareBasic	$ 3.20us-gaap_EarningsPerShareBasic	$ 6.23us-gaap_EarningsPerShareBasic	$ 3.66us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.77us-gaap_EarningsPerShareDiluted	$ 1.12us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted	$ 2.02us-gaap_EarningsPerShareDiluted	$ 1.80us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted	$ 3.11us-gaap_EarningsPerShareDiluted	$ 5.94us-gaap_EarningsPerShareDiluted	$ 3.52us-gaap_EarningsPerShareDiluted

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