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Selected Quarterly Financial Data (Schedule Of Selected Quarterly Financial 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
Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue | $ 187,438 us-gaap_SalesRevenueNet | $ 166,944 us-gaap_SalesRevenueNet | $ 151,512 us-gaap_SalesRevenueNet | $ 147,758 us-gaap_SalesRevenueNet | $ 154,817 us-gaap_SalesRevenueNet | $ 135,717 us-gaap_SalesRevenueNet | $ 120,787 us-gaap_SalesRevenueNet | $ 102,079 us-gaap_SalesRevenueNet | $ 653,652 us-gaap_SalesRevenueNet | $ 513,400 us-gaap_SalesRevenueNet | $ 353,633 us-gaap_SalesRevenueNet
Gross profit | 89,766 us-gaap_GrossProfit | 79,798 us-gaap_GrossProfit | 72,398 us-gaap_GrossProfit | 75,472 us-gaap_GrossProfit | 80,097 us-gaap_GrossProfit | 71,437 us-gaap_GrossProfit | 62,583 us-gaap_GrossProfit | 53,477 us-gaap_GrossProfit | 317,434 us-gaap_GrossProfit | 267,594 us-gaap_GrossProfit | 181,196 us-gaap_GrossProfit
Total operating expenses | 85,538 us-gaap_OperatingExpenses | 71,590 us-gaap_OperatingExpenses | 68,036 us-gaap_OperatingExpenses | 65,955 us-gaap_OperatingExpenses | 62,121 us-gaap_OperatingExpenses | 42,867 us-gaap_OperatingExpenses | 45,787 us-gaap_OperatingExpenses | 35,958 us-gaap_OperatingExpenses | 291,119 us-gaap_OperatingExpenses | 186,733 us-gaap_OperatingExpenses | 120,625 us-gaap_OperatingExpenses
Income (loss) from operations | 4,228 us-gaap_OperatingIncomeLoss | 8,208 us-gaap_OperatingIncomeLoss | 4,362 us-gaap_OperatingIncomeLoss | 9,517 us-gaap_OperatingIncomeLoss | 17,976 us-gaap_OperatingIncomeLoss | 28,570 us-gaap_OperatingIncomeLoss | 16,796 us-gaap_OperatingIncomeLoss | 17,519 us-gaap_OperatingIncomeLoss | 26,315 us-gaap_OperatingIncomeLoss | 80,861 us-gaap_OperatingIncomeLoss | 60,571 us-gaap_OperatingIncomeLoss
Income tax expense | 75 us-gaap_IncomeTaxExpenseBenefit | 1,113 us-gaap_IncomeTaxExpenseBenefit | 694 us-gaap_IncomeTaxExpenseBenefit | 3,559 us-gaap_IncomeTaxExpenseBenefit | 5,248 us-gaap_IncomeTaxExpenseBenefit | 8,279 us-gaap_IncomeTaxExpenseBenefit | 4,791 us-gaap_IncomeTaxExpenseBenefit | 1,569 us-gaap_IncomeTaxExpenseBenefit | 5,441 us-gaap_IncomeTaxExpenseBenefit | 19,887 us-gaap_IncomeTaxExpenseBenefit | 4,338 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 1,551 us-gaap_ProfitLoss | $ 3,084 us-gaap_ProfitLoss | $ 2,125 us-gaap_ProfitLoss | $ 4,877 us-gaap_ProfitLoss | $ 11,224 us-gaap_ProfitLoss | $ 17,640 us-gaap_ProfitLoss | $ 9,343 us-gaap_ProfitLoss | $ 5,883 us-gaap_ProfitLoss | $ 11,946 us-gaap_ProfitLoss | $ 44,119 us-gaap_ProfitLoss | $ 38,941 us-gaap_ProfitLoss
Basic and diluted net income per share | $ 0.01 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.03 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.02 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.05 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.11 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.17 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.10 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.06 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.11 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.45 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.48 us-gaap_EarningsPerShareBasicAndDiluted

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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