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Condensed Consolidated Statements Of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 46,344,584 $ 42,332,882
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,674,712 10,552,370
(Gain) loss on disposal of assets 161,487 507,022
(Gain) loss on sale of investments (1,494,565) (2,371,430)
Impairment loss on available-for-sale securities 0 0
Deferred income taxes 880,311 2,003,651
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock 3,960,579 3,101,524
Excess tax benefits from stock-based compensation (318,115) (1,246,101)
Change in operating assets and liabilities:    
Accounts receivable, net (28,907,130) (20,682,578)
Inventories (11,997,848) (3,307,536)
Prepaid expenses and other 11,876,847 4,712,490
Accounts payable 7,515,474 20,777,628
Accrued liabilities, excluding dividends declared 20,435,185 20,995,621
Net cash provided by (used for) operating activities 61,131,521 77,375,543
CASH FLOWS FROM INVESTING ACTIVITIES:    
Plant and equipment additions (39,824,858) (19,436,397)
Proceeds from sale of plant and equipment 0 47,505
(Increase) decrease in investments 5,839,795 38,010,307
(Increase) decrease in other assets 175,419 2,239,006
Net cash provided by (used for) investing activities (33,809,644) 20,860,421
CASH FLOWS FROM FINANCING ACTIVITIES:    
Issuance of common stock from stock plan transactions 2,466,307 8,142,192
Cash dividends paid (17,288,348) (15,652,134)
Excess tax benefits from stock-based compensation 318,115 1,246,101
Net cash provided by (used for) financing activities (14,503,926) (6,263,841)
NET INCREASE IN CASH AND CASH EQUIVALENTS 12,817,951 91,972,123
CASH AND CASH EQUIVALENTS, beginning of period 357,986,774 348,349,773
CASH AND CASH EQUIVALENTS, end of period $ 370,804,725 $ 440,321,896