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Consolidated Statements of Income (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
NET SALES | $ 1,171,864,171 | $ 1,099,559,521 | $ 1,023,762,049
COST OF GOODS SOLD | 741,131,269 | 726,740,962 | 662,181,714
Gross profit | 430,732,902 | 372,818,559 | 361,580,335
OPERATING EXPENSES: |  |  |
Engineering, research and development | 76,495,051 | 85,003,602 | 81,634,158
Selling, general and administrative | 49,496,038 | 48,359,725 | 48,578,252
Litigation Settlement | 0 | 5,000,000 | 0
Total operating expenses | 125,991,089 | 138,363,327 | 130,212,410
Income from operations | 304,741,813 | 234,455,232 | 231,367,925
OTHER INCOME: |  |  |
Investment income | 6,724,717 | 5,307,180 | 4,165,809
Other, net | 16,597,513 | 9,863,188 | 8,898,077
Total other income | 23,322,230 | 15,170,368 | 13,063,886
Income before provision for income taxes | 328,064,043 | 249,625,600 | 244,431,811
PROVISION FOR INCOME TAXES | 105,134,094 | 81,038,760 | 79,763,583
NET INCOME | $ 222,929,949 | $ 168,586,840 | $ 164,668,228
EARNINGS PER SHARE: |  |  |
Basic (in dollars per share) | $ 1.55 | $ 1.18 | $ 1.16
Diluted (in dollars per share) | $ 1.55 | $ 1.17 | $ 1.14
Cash Dividends Declared per Share (in dollars per share) | $ 0.56 | $ 0.52 | $ 0.48

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