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Summary Of Quarterly Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Summary Of Quarterly Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 351,959 us-gaap_SalesRevenueNet | $ 383,523 us-gaap_SalesRevenueNet | $ 390,122 us-gaap_SalesRevenueNet | $ 360,203 us-gaap_SalesRevenueNet | $ 354,073 us-gaap_SalesRevenueNet | $ 338,297 us-gaap_SalesRevenueNet | $ 352,583 us-gaap_SalesRevenueNet | $ 332,106 us-gaap_SalesRevenueNet | $ 1,485,807 us-gaap_SalesRevenueNet | $ 1,377,058 us-gaap_SalesRevenueNet | $ 1,293,338 us-gaap_SalesRevenueNet
Gross profit | 182,165 us-gaap_GrossProfit | 213,336 us-gaap_GrossProfit | 218,518 us-gaap_GrossProfit | 202,097 us-gaap_GrossProfit | 188,665 us-gaap_GrossProfit | 185,783 us-gaap_GrossProfit | 197,698 us-gaap_GrossProfit | 183,974 us-gaap_GrossProfit | 816,116 us-gaap_GrossProfit | 756,118 us-gaap_GrossProfit | 699,148 us-gaap_GrossProfit
Operating income | 34,801 us-gaap_OperatingIncomeLoss | 72,189 us-gaap_OperatingIncomeLoss | 83,219 us-gaap_OperatingIncomeLoss | 70,046 us-gaap_OperatingIncomeLoss | 61,328 us-gaap_OperatingIncomeLoss | 65,485 us-gaap_OperatingIncomeLoss | 78,763 us-gaap_OperatingIncomeLoss | 61,188 us-gaap_OperatingIncomeLoss | 260,255 us-gaap_OperatingIncomeLoss | 266,762 us-gaap_OperatingIncomeLoss | 262,563 us-gaap_OperatingIncomeLoss
Net income attributable to stockholders | $ 25,961 us-gaap_NetIncomeLoss | $ 52,142 us-gaap_NetIncomeLoss | $ 57,218 us-gaap_NetIncomeLoss | $ 46,585 us-gaap_NetIncomeLoss | $ 43,258 us-gaap_NetIncomeLoss | $ 45,688 us-gaap_NetIncomeLoss | $ 53,995 us-gaap_NetIncomeLoss | $ 44,860 us-gaap_NetIncomeLoss | $ 181,906 us-gaap_NetIncomeLoss | $ 187,800 us-gaap_NetIncomeLoss | $ 178,267 us-gaap_NetIncomeLoss
Earnings per Share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic | $ 1.12 us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic | $ 1.01 us-gaap_EarningsPerShareBasic | $ 0.82 us-gaap_EarningsPerShareBasic | $ 3.63 us-gaap_EarningsPerShareBasic | $ 3.53 us-gaap_EarningsPerShareBasic | $ 3.24 us-gaap_EarningsPerShareBasic
Diluted | $ 0.54 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 1.10 us-gaap_EarningsPerShareDiluted | $ 0.89 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted | $ 0.99 us-gaap_EarningsPerShareDiluted | $ 0.81 us-gaap_EarningsPerShareDiluted | $ 3.58 us-gaap_EarningsPerShareDiluted | $ 3.48 us-gaap_EarningsPerShareDiluted | $ 3.17 us-gaap_EarningsPerShareDiluted

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