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Condensed Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 87,111,123 $ 80,805,051
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,138,931 21,283,279
(Gain) loss on disposal of assets 397,298 539,865
(Gain) loss on sale of investments (4,235,900) (5,177,464)
Deferred income taxes 1,729,418 7,328,085
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock 7,991,705 6,419,575
Excess tax benefits from stock-based compensation (586,535) (2,599,659)
Change in operating assets and liabilities:    
Accounts receivable, net (19,558,762) (16,211,416)
Inventories (3,576,693) (18,728,798)
Prepaid expenses and other 3,305,799 765,712
Accounts payable (11,955,646) 22,987,528
Accrued liabilities, excluding dividends declared 15,768,179 7,203,272
Net cash provided by (used for) operating activities 101,528,917 104,615,030
CASH FLOWS FROM INVESTING ACTIVITIES:    
Plant and equipment additions (69,424,380) (48,995,466)
Proceeds from sale of plant and equipment 10,803 77,509
(Increase) decrease in investments 14,340,148 53,504,964
(Increase) decrease in other assets (725,542) 2,474,000
Net cash provided by (used for) investing activities (55,798,971) 7,061,007
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock from stock plan transactions 7,439,914 14,775,493
Cash dividends paid (36,036,136) (32,781,030)
Excess tax benefits from stock-based compensation 586,535 2,599,659
Net cash provided by (used for) financing activities (28,009,687) (15,405,878)
NET INCREASE IN CASH AND CASH EQUIVALENTS 17,720,259 96,270,159
CASH AND CASH EQUIVALENTS, beginning of period 357,986,774 348,349,773
CASH AND CASH EQUIVALENTS, end of period $ 375,707,033 $ 444,619,932