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Condensed Consolidated Statements of Cash Flows (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 97,527,964 | $ 87,111,123
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 27,566,632 | 25,138,931
(Gain) loss on disposal of assets | 2,010,463 | 397,298
Gain on sale of investments | (8,567,087) | (4,806,646)
Loss on sale of investments | 714,756 | 570,746
Deferred income taxes | (3,024,452) | 1,729,418
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 8,077,955 | 7,991,705
Excess tax benefits from stock-based compensation | (1,495,850) | (586,535)
Change in operating assets and liabilities: |  |
Accounts receivable, net | (10,607,330) | (19,558,762)
Inventories | 43,928,296 | (3,576,693)
Prepaid expenses and other | 329,541 | 3,305,799
Accounts payable | 589,628 | (11,955,646)
Accrued liabilities, excluding dividends declared | 15,235,030 | 15,768,179
Net cash provided by (used for) operating activities | 172,285,546 | 101,528,917
Activity in available-for-sale securities: |  |
Sales proceeds | 31,899,490 | 18,968,556
Maturities and calls | 6,250,000 | 31,000,000
Purchases | (51,633,929) | (35,628,408)
Plant and equipment additions | (24,067,012) | (69,424,380)
Proceeds from sale of plant and equipment | 15,510 | 10,803
(Increase) decrease in other assets | (531,456) | (725,542)
Net cash provided by (used for) investing activities | (38,067,397) | (55,798,971)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Issuance of common stock from stock plan transactions | 16,030,793 | 7,439,914
Cash dividends paid | (38,701,691) | (36,036,136)
Excess tax benefits from stock-based compensation | 1,495,850 | 586,535
Net cash provided by (used for) financing activities | (21,175,048) | (28,009,687)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 113,043,101 | 17,720,259
CASH AND CASH EQUIVALENTS, beginning of period | 389,678,664 | 357,986,774
CASH AND CASH EQUIVALENTS, end of period | 502,721,765 | 375,707,033
Equity [Abstract] |  |
Common stock issued under stock compensation plan (in shares) | 1,190,696 |
Dividends payable (in dollars per share) | $ 0.14 |
Dividends payable | $ 20,200,000 |

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