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Unaudited Condensed Consolidated Statements of Income (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Income Statement [Abstract] |  |
NET SALES | $ 368,937,455 us-gaap_SalesRevenueGoodsNet | $ 335,739,344 us-gaap_SalesRevenueGoodsNet
COST OF GOODS SOLD | 225,845,046 us-gaap_CostOfGoodsSold | 204,440,537 us-gaap_CostOfGoodsSold
Gross profit | 143,092,409 us-gaap_GrossProfit | 131,298,807 us-gaap_GrossProfit
OPERATING EXPENSES: |  |
Engineering, research and development | 21,587,551 us-gaap_ResearchAndDevelopmentExpense | 20,489,227 us-gaap_ResearchAndDevelopmentExpense
Selling, general & administrative | 13,796,352 us-gaap_SellingGeneralAndAdministrativeExpense | 13,632,034 us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses | 35,383,903 us-gaap_OperatingExpenses | 34,121,261 us-gaap_OperatingExpenses
Income from operations | 107,708,506 us-gaap_OperatingIncomeLoss | 97,177,546 us-gaap_OperatingIncomeLoss
OTHER INCOME |  |
Investment income | 612,025 us-gaap_InvestmentIncomeNonoperating | 325,158 us-gaap_InvestmentIncomeNonoperating
Other, net | 97,359 us-gaap_OtherNonoperatingIncomeExpense | 4,189,386 us-gaap_OtherNonoperatingIncomeExpense
Total other income | 709,384 us-gaap_NonoperatingIncomeExpense | 4,514,544 us-gaap_NonoperatingIncomeExpense
Income before provision for income taxes | 108,417,890 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 101,692,090 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR INCOME TAXES | 31,234,449 us-gaap_IncomeTaxExpenseBenefit | 33,126,019 us-gaap_IncomeTaxExpenseBenefit
NET INCOME | $ 77,183,441 us-gaap_NetIncomeLoss | $ 68,566,071 us-gaap_NetIncomeLoss
EARNINGS PER SHARE: |  |
Basic (in dollars per share) | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted
Cash Dividends Declared per Share (in dollars per share) | $ 0.08 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.07 us-gaap_CommonStockDividendsPerShareDeclared

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